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"caught on camera." watch out! 30,000 tons of rock come crashing down on to a two-lane highway. threatening road crews working in the area. >> i looked up and the trees were dock down at the same time. so we knew this was not your average old slide. we didn't expect anything like that. >> that's something you'll never forget. >> november 10, 2009, polk county, tennessee. a dreary, chilly morning and wdef news cameraman alan fair banks is covering the story of a boulder that has fallen on to u.s. 64.

>> originally we were just going to try to get some pictures of a boulder out in the middle of the road. we didn't know how big and we didn't know if there were any cars trapped underneath. >> when fairbanks and reporter bill mitchell arrive, the road was lowsed to traffic and the tennessee department of transportation, better known as tdot, is using a giant hydraulic hammer to break up the rock. >> it was huge, massive, they covered up an entire lane of the road. they were hitting this thing with all they had. it was not crack. you could see little splinters of rock fly up into the air. but as far as breaking that thing apart, it wasn't going anywhere. >> the 24-mile two-lane highway goes through an narrow pass, and is flanked by little frog mountain on one side and the okohee river on the other. the detour around the mountain adds more than two hours to the commute.

>> there's a tremendous amount of pressure to get the road open. but you've got to do it and do it safely, though. >> steve jones, tdot's polk county supervisor knows commuters want him to work fast. >> we got people that could get mad at us when we stop them for five minutes doing maintenance work. you can imagine what it was like for hours. >> according to jones, the area gets two to three rock slides a year and when they happen, a tdot geologist is always called to the scene. >> it's her call to view the situation to see whether we can get it safely done. get everything stashlized. to make sure it's safe for the traffic to come through. >> vanessa bateman is in her tdot office in nashville when she gets the report of a rock slide in polk county. >> at that point it wasn't clear that they had an emergency, but they had a rock in the road, the road was closed. so when the road is closed, everybody gets excited. okay, what's going on. >> it takes bateman three hours to drive to the site whxt he she

arrives, there are about 30 people working to get the road open. >> the emergency response folks from chattanooga were there, the county maintenance guys were there and a construction company had been called to come in to bring in the equipment that would be needed to break up the rocks that were on the road, get them off. there was one larger rock and there was a news crew. >> we saw somebody from tdot show up. and this young lady got out and she walked up and she looked at me and she walked on past. and she glanced at the boulder and then she went over and talked to mr. jones. >> bill mitchell, a 30-year news veteran, has covered many rock slides during his career. but none this big. >> and then she came back over and she said, why don't you guys move back a little ways. i'm hearing things up on that mountain that really unnerve me. and i said, what are you hearing? and she said, i'm hearing pops and snaps and things that make me believe that some more debris may come down. so we moved back about 20 yards.

about that time. >> i heard a sound that sounded almost like a car door slamming. it was a sharp report. i talked to steve, the county maintenance supervisor, have you heard that sound before. and he said yes, we've heard this sound before. and that point we need all this construction equipment to stop so we can hear. >> sensing danger, they stopped the jackhammer and moved the news crews farther back. >> vanessa takes a look at the mountain and she walks back and she's talking to some of the tdot personnel and all of a sudden they start walking back. she jumped in her car and drives to the other end of the road. and they're walking backwards, they go right past me and i turn to them and i say what's going on? what did she say? and they said, she said the mountain is going to come down. and i said really? and she said yes, she said run. >> fairbanks moves to safety,

but as a a photojournalist instinctively keeps his camera rolling. even when it looks like nothing is going to happen. >> i set up the camera and waited. and our reporter, bill mitchell came up and he said, you know, we probably ought to get back to the station. and i said, you're probably right. and i said, i don't know, she looked really convinced. so we waited. so we almost both gave up at this point and almost turned our heads away for a minute and all of a sudden a big slab of rock came down. >> 30,000 tons of mountain crashes down onto the road. it takes only seconds for rocks, earth and trees to descend on to the road where the men were just standing. >> the rocks hitting ground were -- you could almost feel it shake. and all you could hear was the

rumbling sound. it sounded like something right out of a movie. it sounded like cars crashing. the rocks were just hitting the ground and all of a sudden, it stopped and everything came to a standstill. >> standing there looking at this thing, not even believing my eyes and then the whole thing comes rushing down the slope with this immense amount of noise and dust. you never see something like this in person. >> there's a bunch of stuff going through your mind to see rocks the size of greyhound buses come off the side of that mountain. when they hit the road, we found pieces of the yellow line in the center of the river, 200 feet away. the road was gone. when i watched those rocks come down, they didn't stop. >> i wonder, if anybody had been out there, could we have found them? >> while the road crew assesses

the massive damage, the news crew asks themselves the age-old photojournalist question -- did we get the shot? >> my big worry was, was it actually rolling. i waited a little while before i hit stop. and then i thought -- please let this be on camera. please let this be on camera. and i went back and rewound the tape and -- hit play and there it was. and it felt -- felt a big sense of relief. got it. >> i knew he had it when he didn't talk to me. he just stood there and grinned. >> it takes road crews five months to reopen the highway. the total cost of the clean-up? $2.1 million. >> we work in the snow, we worked in the rain to get the site stabilized to where we could open the road again. these guys started working from ropes. doing the initial scaling so it was safe to move equipment in below the slope and then a lot of work was done from a crane. we actually went in and used

rock bolts. 15 to 40 feet into the rock face and added bolts to the sirt to try to stabilize everything. >> while the community is happy that the road is open again, they are also proud. because of the quick thinking and expertise of a road supervisor and a geologist, no one is injured or killed by the rock slide. >> i get some cold sweats from time to time, thinking about all of the things that could have gone wrong that day. if i had stopped for coffee. take an little extra time to go have lunch before coming out to the site. the timing of everything was such that once i got there, we had time to see what was going on, get everybody out of the way before the slide actually occurred. >> had she not have been there, those rocks would have come down on not just bill and myself, but everybody that was working that scene, all the tdot crews, it would have been a much, much different story. had we had been standing in that same spot.

>> coming up, winds cause this bridge to swing wildly. forcing commuters to run for their lives. >> we were watching steel and concrete half a mile long twisting 20 times a minute. >> when "caught on camera" continues. opportunity here. i can use walmart's education benefits to get a degree, maybe work in it, or be an engineer, helping walmart conserve energy. even today, when our store does well, i earn quarterly bonuses. when people look at me, i hope they see someone working their way up. vo: opportunity, that's the real walmart.

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it may look like special effects from an old hollywood movie, but this is real. a massive steel and concrete bridge sways and buckles, leaving commuters desperate to escape before it collapses. >> it was breathtaking. it was frightening. >> november 7th, 1940, tacoma, washington. it's a blustery day in puget

sound, located in the northwest section of the evergreen state. winds are gusting a little more than 40 miles per hour, causing the tacoma narrow's bridge to really sway. surprising as it looks, the movement doesn't stop cars and pedestrians from crossing it. ever since the bridge's opening four months earlier, residents affectionately call her galluping gertie. because of the way she dances and snakes in the wind. bridges are designed to move a little, but gertie's movements seem a bit extreme. for some residents, crossing her is lake an adventure. >> it was a thrill. it was like a carnival ride. almost a roller coaster. >> historian and author richard hobbs writes about the tacoma narrows bridge in his book, "catastrophe to triumph." >> people would come out on a windy day when there was extra bounce in the bridge and walk across. the motion could be fairly dramatic.

>> but some find that wave like motion harrowing. >> as you drove across the bridge you could look ahead and the car in front of you maybe 100 yards would absolutely disappear as you went down the bottom. it was unnerving to a lot of drivers. many who crossed the bridge swore it would be the last time. and on that windy autumn day in 1940, it is the last time anyone crosses that bridge. >> about 10:00 the bridge began to move in ways it had not moved before. the undulations became higher and the ripples across the bridge were verging on dangerous. >> at 10:15 a.m. one of the bands holding the suspension cable breaks, causing the bridge to move not only up and down, but back and forth. >> once that started the bridge increasingly began to twist.

there was a car that had been trapped out on the bridge. a car driven by leonard postworth, a tacoma tribune editor. he was headed over to his summer cottage in the harbor area. in the back seat was his daughter's dog tubby. as the bridge began to twist, it was impossible to drive. >> he tries to get out of the car, but he can't open the door, so he climbs out of the window and tries unsuccessfully to walk on the bridge. >> he didn't get very far before he realized that the situation was so dangerous he might not get back, and he better go back and get tubby. >> but the bridge twists and writhes so violently, he can't safely go back for the dog. >> he was continually being thrown to the pavement and staggering to one side or the other. virtually crawling part of the way to the safety of the east tower. >> another person trying to

escape from the bridge that day is professor bert farquharson. >> professor bert farquharson was a professor of engineering at the university of washington. and he was an authority on bridge structures. so when eldridge and lacey murrow at the washington state highway department became concerned about how much this bridge might move, they hired bert to conduct some studies. >> as part of his study, dr. farquharson sets up film cameras a few weeks after the bridge opens to capture its movements. several weeks later the same cameras capture the drama of the bridge's final movements as they unfold. >> the phenomenal thing is we're watching steel and concrete half a mile long, twisting 20 times a minute. as the twisting increased, light poles began to dance not only back and forth but to snap off the suspender cables that went

from the bridge deck to the main suspension cable itself began to snap. >> and then the unimaginable happens. the massive steel structure bends, whips and contorts so violently that it collapses into the rushing water below. both make it off the bridge alive, but not tubby. he's still in the backseat when the structure gives way. the bridge failure makes news all across the world. >> the tacoma narrows bridge dedicated in 1940 was the pride of the northwest. four months after it was opened those winds sent the bridge into a rhythmic dance of death. it literally shook it self to pieces. >> very early in the process, in fact before construction began, the lead engineer was very

concerned about the bridge, so he began to help initiate studies by the professor at the university of washington that began to closely examine the bridge's movement. >> remedies are attempted before and after the bridge opens. >> they added cable tie downs at each end of the bridge on the approach spans. they did a good job of holding the approach spans in place. but the rest of the bridge across the center span still moved a lot. >> professor farquharson also issued an in-depth bridge study and presents two more options to stabilize the bridge, just five days before gertie collapses, but they never get the chance to implement those plans. tim moore, senior structural engineer for washington's department of transportation

says the cause of the collapse was torsional flutter or aerodynamic instability. >> that was the vice that took the bridge down. this was a condition that no structure can maintain for a significant period of time. >> gertie is replaced by a stronger bridge in 1950, ten years after the collapse. but a part of it still survives. >> this is the side span, the approach span. this is the original galloping gertie's 1940 bridge. you can see the two eight-foot-deep section. >> many lessons are learned from gertie's demise, including how critical aerodynamics are in building suspension bridges. >> there really wasn't a major suspension bridge built until the replacement in 1950. and many of the things that

exist on the 1950s bridge are a tribute to better aerodynamic stability. >> in 2007 a twin bridge is completed. the architectural look of both structures resembles the original gertie, a tribute to her grace and elegance. >> so that new bridge as well as others have been constructed since 1940 are part of galloping gertie's legacy. coming up -- an iceberg implodes in front of a group of tourists sending them scrambling for safety. >> we're all shouting and screaming. >> when "caught on camera: watch out" continues. mamake a wish!h! i wish w we could lie e here forevever. i wish thihis test dririve was , so we e could headad back to thehe dealershihip.

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screaming. >> a giant iceberg implodes in front of his eyes, and luckily for us in front of the lens of his small digital camera. >> the adrenaline rush was enormous. february 10th, 2012, antarctica. while on the trip to argentina, lex and his girlfriend pietra set out to explore the remote continent. antarctica is 720 miles from the argentinian coast. and from their words, so close. >> you should try to go there. normally it would be way too expensive. >> a travel group sponsors tours several times a year, particularly during the six arctic summer months from october through march. >> twice a day do expeditions. so you go in the small raft. antarctica is a different world.

if you haven't been there, you can't imagine what it's like. it's so beautiful, the scenery. you have all these animals you have nowhere else in the world. you have two types of moss that grow there. that's it. yeah, it's amazing. >> although the antarctica vistas are spectacular, they're set against the backdrop of frigid weather. average temperatures on the continent hover around minus 70 degrees fahrenheit. at the time of the trip it was summer and it was a bit warmer. >> it was around zero. it was really cold. the wind is really cold. the ice is really cold. a lot of layers on. jackets, scarves, hats. >> despite the bitter cold, lex and company soak in every breathtaking moment of this remarkable landscape. >> we were down on the raft and flowing past beautiful icebergs

and islands. >> the raft circles close enough to get a true appreciation of how enormous and imposing they really are. one in particular catches lex's eye. >> this iceberg, it was really beautiful. i think it's the most beautiful iceberg i saw there. everything is sort of black and white and then this sharp blue iceberg float in the water. i really like sculptures. this one sort of looked like a skull in the beginning. then pieces were falling off. the group returns to the ship but is so intrigued by the iceberg they go back on a second expedition that same day to get a better look at it not knowing the extraordinary moment that is about to unfold. >> oh, cool!

i just switched on my camera. we went again because when you're in antarctica, you want to do as much as you can. you're never going to be there again. >> when they get close, lex sees the big floating block of ice has changed. it's hollowed out because gigantic pieces of it continue to fall off more rapidly and are crashing into the water. >> oh, cool! >> pieces were falling off. it was a lot of noise. and so we were circling it for, i think, six minutes, something like that. and then at one point when we were thinking, okay, nothing is going to happen. >> and just when lex thinks the dramatic show is over, the iceberg gives an unexpected finale.

>> it just fell apart. a perfect implosion. and these big chunks of ice just were thrown towards us. like the iceberg spit them out. >> the giant iceberg collapses plunging into the deep, frigid water. it's a frightening scenario because the impact from the implosion could easily overturn the little raft. despite the danger, lex isn't feeling fear. >> the adrenaline rush was enormous. we were all shouting and screaming. >> quickly the tour guides maneuver the wrap away from the falling chunks of ice and any potential large waves. >> you can still see some chunks hitting the boat.

>> after the ice stops raining down on the boat, sheer excitement takes over. >> this is a very old iceberg, if you can imagine such a thing. >> geologist and college professor robert titus analyzes lex's footage and says the iceberg had all the telltale signs of an impending breakdown. >> now what's happening here is this iceberg drifted into warm water. the warmth of the surrounding water caused the ice to expand and to contract and to fracture and to crack. and by the time these people got there the whole thing simply collapsed. >> lex uploads his incredible shot to youtube and within one month he gets 200,000 views. sometimes it takes traveling thousands of miles away from home to be in the right place at

the right time. i was really lucky. and happy to show it to the rest of the world. coming up -- residents of a small italian town run for their lives to escape a massive landslide. when "caught on camera: watch out" continues. he's agreed to give it up. that's today? [ male announcer ] we'll be with him all day as he goes back to taking tylenol. i was okay, but after lunch my knee started to hurt again. and now i've got to take more pills. ♪ yup. another pill stop. can i get my aleve back yet? ♪ for my pain, i want my aleve. ♪ [ male announcer ] look for the easy-open red arthritis cap.

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president obama honor america's war dead this memorial day. with the annual wreath-laying ceremony at arlington national cemetery's tomb of the unknowns, he was accompanied by the first lady. syria foreign minister said his country has agreed to take part in peace talks next month, ending the bloody civil war there. and royal caribbean tweeted

out this picture after a fire on one of its cruise ships headed to the bahamas this morning, no injuries reported. now back to "caught on camera." a massive river of mud, trees and dirt flows down a mountain side, threatening a small town. forcing people to run for their lives. february 15th, 2010, italy. the ancient town has had its share of landslides, but after nine days of relentless rain, residents are bracing for what looks like an unprecedented disaster. husband and wife journalist are

called to cover the unfolding story by the mayor of the town. >> translator: the mayor that i was acquainted with urged me to go and see it. however, it was a period of strong torrential rains that continued for days and days and there were landslides just about everywhere. so we decided to do different ones and wait. >> by the time they arrived most of the small town of 200 is evacuated but people remain near the danger zone, not expecting the hillside to come down. astonished at the scene unfolding in front of her, the woman grabs her camera from the back of her car and starts shoot ing. >> translator: in the distance i framed a high voltage pole that very slowly began to descend, descend, descend until it finally toppled over. that's when we realized that this was something much more serious than we could imagine. >> what she sees through her camera's view finder is something out of a biblical text.

the earth buckles, waves and moves like an ocean. >> translator: little by little we saw the hill start to crumble, and then at a certain point suddenly the mountain came tumbling down. i don't know if i realized it or i hadn't realized it, i planted myself there with a television camera on my shoulder and record it. >> the civilian protection men try to block them from shooting, but they just keep on working. >> translator: at a certain point we heard a deafening noise far away. and then this imposing immense landslide. i have to tell the truth, i didn't check my words. luckily i didn't say anything

strange, and we went live recording video and audio. and reporting what is immediate sensation. that was precisely the effect. something unimaginable, unforeseeable was happening before our eyes. and it was huge. [ speaking foreign language ] >> geologist and college professor robert titus explain this geological phenomenon. >> i think this was an extraordinary landslide. first for the power it displayed. you saw choppy waves of soil moving up and down, sliding by at a remarkable rate of speed. any person, any animal in the way would have been killed. any house, any home, any building would have surely been destroyed. >> titus says the heavy and

prolonged rainfall prior to the landslide saturated the ground, turning the limestone rock and soil into an oozing muck. >> all this is astonishing. it's almost like watching water flow by. >> wave after wave of soil, rock and trees break off and crumble down the mountain. the landslide keeps going and going and going. this scene lasts for 30 minutes, and petritsia and mauricio record it all. >> the effect was truly hypnotic because of what was happening. to tell you the truth we accepted the images later. >> despite some people choosing not to evacuate, nobody is injured or killed and perhaps more astonishing, no homes are lost. >> translator: we were in an

area totally outside of the town. the last house that's visible is precisely the last house in town. there's nothing beyond that point. there's only a road that links it with another town that now doesn't exist anymore either. >> after they visit the landslide area two years later they are concerned that no repairs have been done. the road is still not fixed and the mountain side is not secured. mauricio is especially affected since he was born here and still has family there. >> translator: sometimes i go back there. it also happens that i go back to that area. i must tell the truth it upsets me. two years later nothing has been done and i'm very sorry about that. >> geologists say the landslides of this magnitude are somewhat unpredictable. luckily for the people, everyone survived this one. [ shouting ]

coming up, fear strikes tinseltown when an enormous sink hole opens up in the middle of hollywood boulevard. >> my first concern was anybody killed or injured. >> when "caught on camera: watch out" continues. everyone's retirement dream is different;

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>> june 22, 1995, hollywood, california. tinseltown brings to mind the image of big homes, big stars, and the iconic hollywood sign. but this unfolding disaster is not happening in the hollywood hills or on an expensive soundstage. >> that part of hollywood is not the glamour part of hollywood. we call it east hollywood here in los angeles. it's more residential. it's more community. >> jackie goldberg is a former los angeles city councilwoman. in 1995 she represents a district where the city is building a subway. it's one of the largest public works projects of its time, and some of the constituents are complaining about it. >> we don't need a metro rail as they are proposing it. let's get back to the buses where the people can be moved around properly. >> not only are residents complaining, but so are the business owners.

for them it's less about the subway itself than the construction. they're losing money. >> it takes so long to build these things underground and you don't have much choice but to tear streets up and close streets. businesses were putting big signs on their property saying, open for business during construction because it looked like you couldn't get there. and people were angry. >> so when a water main breaks at the construction site on hollywood boulevard, goldberg holds a press conference to bring attention to the problem. as goldberg stands in front of news cameras, the water main problem suddenly gets much worse. >> we were actually not far from the actual location that morning. some people were very concerned that a lot of water was being pumped out from under the soil involved. so we had engineers and technical people all explaining that this was going to be fine, and then crack. >> the crack she hears is the

sound of the roadway caving into the subway tunnel under construction. mud, rocks, dirt and water cascade down into a big hole, exposing sensitive utility pipes. the news crews on site capture the dramatic event as it unfolds. >> my first concern was is anybody hurt or killed in the hole. when they heard the crack they all moved away from the street to be sure that nothing was going to happen. >> the crater keeps expanding until it measures 70 feet wide and 70 feet deep. as the hole grows in size, so does goldberg's anxiety. her biggest fear is the exposed gas lines. >> we have all the gas company people out there to start shutting off gas lines around the area. you break a water line you get water. you break an electric thing you might get a live wire down.

but gas explodes. so we got the gas turned off pretty darn quickly. that's why there were no explosions in the surrounding area. >> the neighboring streets are shut down to traffic. about 70 patients are evacuated from a nearby hospital. although people in the area are inconvenienced, no one is injured or killed. city and state investigations conclude that the sink hole is caused by the water main break, but there's still debate about whether it was caused by corrosion of the aging main or triggered by subway construction. >> it was a broken main. not just the pipe but the main. and that water had been coming in for some time before it was detected. >> crews repair the water main, fill the hole with concrete and repair the road. hollywood boulevard becomes a bustling thoroughfare once again.

in 1999, four years later, the red line stop at hollywood and western is finally completed. passengers ride the trains and all is well in the city of angels. coming up -- an entire industrial building collapses from heavy snow as employees run for their lives. >> it sounded like a freight train coming. when "caught on camera: watch out" continues. there's a new way to fight litter box odor. introducing tidy cats with glade tough odor solutions. two trusted names, one amazing product.

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a huge industrial building collapses under the weight of heavy snow. >> wow. i can't believe this has occurred. >> but the terrifying question is -- >> oh my gosh, is everybody okay? did everyone get out?

february 3rd, 2011, easton, massachusetts. the northeast experiences one of the worst winters in years. snowfall averages in region break records. peter howe is a reporter for new england cable news in newton, massachusetts. >> it was a horrible winter. i can't remember what the first snow was, but it was probably november. it started snowing. it kept snowing every five days. it never got warm enough for it to melt. the snow piled up and piled up and piled up. >> that morning a snowy, icy rain is falling. howe and cameraman brian butler are sent to cover potential roof collapses all over the county. >> we knew the day before there may be some roof problems because of all the snow on roofs and the added weight of the water and the assignment desk called us. they said there's a building in easton, massachusetts. can you head over that way? we said sure. >> they arrive at the triton building a few minutes before 11:00 a.m., and are astonished to see the entire building is

buckling. >> we had been hearing extraordinary sounds. just kind of groaning, creeking, the twisting of metal and bricks popping out as the wall falls in. >> hao wonders is there anyone still in the building. the building is the east coast hub of tritan technologies. a 24-hour call center with about 100 employees. tritan's chief legal counsel, kathleen dias, works at the facility. she hadn't yet arrived but employees called her alarmed by the loud noises the brick building is making. >> somebody described it like a freight train coming, and then the fire alarms went off. it was really people seeing ceiling tiles moving and going that's not normal. something really serious is going on here. >> a supervisor ordered everyone out of their seats and hurries them to an exit.

>> luckily we have a sales manager on the floor who heard the noises and literally stood up and started shouting at people to get out of the building and grabbed people and got their attention and pushed people out the door. >> it's only a few minutes after the last employee leaves that the building starts to fall. >> the wall of the building was bowed and it was slowly falling backwards away from us. >> you could hear glass begin to crack as the strain of the building is going on itself. >> probably a 30-foot wall, 30 feet high just slowly leaning back in a bowed position. and all of a sudden everything accelerates. and it goes from creek, creek, bang to just the whole thing just falls. it's easily the most extraordinary thing i've been bear to witness.

>> tritan loses an office building but no lives. the company credits quick thinking staff with getting everyone out in time. jay nally is tritan's president and ceo. >> we had to do extraordinary things to get everybody out of the building safely. >> some of the employees had the presence of mind to react to it. >> a 100-year-old building collapses in the middle of a busy city. sending firefighters scrambling for safety. >> there's a gut feeling. i knew something would happen. >> may 5th, 1997. new york city.

more than 200 firefighters are called to the scene of an unrelenting blaze in the heart of manhattan's garment district. it starts in the cramped, narrow basement of a shoe store which is packed to capacity with highly flammable material. the century old building has no sprinkler system. >> the fire was so heavy in the basement, we tried to put it out with foam. >> there were heavy boxes. mostly shoes we think stored up to the ceiling. >> retired assistant chief harry norum was one of the commanders overseeing operations that day. >> they went to the staircase inside. there were no exterior openings. so now the officer takes four or five men into the cellar. the boxes were falling down into the area of escape. so first the chief says okay, let's get out of the cellar. >> they are forced to fight the fire from the outside but that has its risks.

norum is concerned the old building will not be able to withstand the heat of the fire, and the weight of the water being pumped in to fight it. >> we were providing 500 gallons per minute at these locations. which leads to the dead load in the building. >> the city's buildings department tells norm that the structure is stable because there aren't any cracks or bulges in the walls but he doesn't take any chances and establishes a wide perimeter or collapse zone around it. >> we move those trucks and the tower ladders, are pieces of equipment, and the hose lines away from the building to the opposite side of the street. >> firefighters are also repositioned across the street and continue their efforts to control the blaze. norum's instincts are right. after nine hours of fire and thousands of gallons of water pumped in, the walls suddenly give way, raining bricks and

debris on the street below. >> the initial sound to me was like a crack. then a rumble. and then, of course, everything became physical. you could see the interior collapsed. pulled the wall down in a curtain like fashion. >> residents are grateful there are no fatalities or serious injuries. but the loss of homes and businesses is a blow. >> your life is gone. everything that you had. everything is just gone. >> for chief norum the collapse emphasizes an important caution, there are often hidden hazards behind the fire and smoke. >> it's very, very important that people in the area, especially firefighters and agency people know that the dangers don't subside after fire is brought under control

. terrifying, dangerous, explosive situations. split-second dilemmas. a house on fire. >> flames come through that window like they belonged to the house and i didn't. a car out of control. >> i knew i was probably going to die. a downed sightseeing plane. an abduction in broad daylight. >> it looked like she was fig fighting for her life. >> witnesses must decide whether or not to intervene at their own risk. >> i got to think quick before someone kills some