this is "nightline." >> tonight, police narrow their search for two convicted killers on the loose. how the inmates executed an escape so elaborate, investigators suspect an inside job. digging, cutting, crawling their way to freedom putting a community on edge tonight. >> shark land. he can usually be found living it up in entourage. but offscreen his natural habitat is a lot closer to this. turns out the hollywood heartthrob is a conservationist, tonight he is taking us swimming with sharks off the costa rican island where natural paradise is under threat. >> if you want to look like beyonce, you have to eat like beon say. that part got a little easier. tonight the pop star's biggest announcement. and why she wants to get you fearless and flawless.

but first, the "nightline" five. >> there is something out there. a highly contagious disease, even fatal to infants. many who spread it may not know they have it. it's called whooping cough. and the cdc recommend everyone including those around babies make sure their whooping cough vaccination is up today. understand the danger your new grandchild faces. talk to your doctor or pharmacist about you and your family getting a whooping cough vaccination today. >> number one in just 60 seconds.

♪ ♪ good evening. thank you for joining us. we begin tonight with the urgent search currently under way for two convicted killers. the drama began this weekend, when the cons apparently used

power tools to escape new york's clinton correctional facility. their brazen meticulous prison break seems straight out of a movie. but for nearby residents, the present danger is real. here's abc's gio benitez. >> reporter: tonight the first convicts to ever break out of this maximum security prison are on the run two days and counting. 34-year-old david sweat and 34-year-old richard matt convicted murderers gone without a trace from the clinton correctional facility in upstate new york. >> they could be literally anywhere. we are leaving no stone unturned. >> reporter: investigators at the home of a prison employee joyce mitchell part of the investigation into how the two inmates were able to pull off a daring complex escape. reminiscent of the hollywood blockbuster "the shawshank redemption." ♪ >> be on the lookout for two escapees from clinton county correction facility. >> reporter: officials say the men were last seen at 10. 30.

p.m. friday night for bed check. reported missing at bed check the following morning at 5:30 a.m. leaving this note behind. reading "have a nice day" in their empty beds clothing was arranged to make it look like some one was sleeping. police say sweat and matt used power tools to drill through a wall and work their way down four stories, shimmying through 24-inch pipes after climbing through a series of catwalks and pipes they walked three to 400 yards down a tunnel coming to a manhole they sawed open with their tools. >> what is the most troubling fact is they needed power tools to do what they actually did. and they were heard. they had to be heard. >> reporter: the manhole where the two men surfaced seen on google earth was only one block from the prison walls. just after 12:30 a.m. a local resident tells us he saw the two convicts in his backyard. >> what did you say? you yelled something at them? >> i first came around the side of the building of my house. i saw the shadow running away from it. so i went around to see who they

were because i want to know who was in my backyard. so i go look at them i see them i ask them what the hell are you doing in my yard get the hell out of here. and he was like sorry i don't, i didn't know where i was. i'm on the wrong street. >> now once you know who it was that you saw what are you thinking? >> lucky to be alive, man. they could have done anything. like they could have jacked my car. and you know you never know. they're criminals. >> i was just in shock. i couldn't believe it. >> reporter: police did not begin their search until a full five hours later giving davethem a head start. governor andrew cuomo came to the prison to retrace the epscape route. >> when you look at how it was done it was extraordinary. you look at the presequestration

ofpresequestration -- precision of the operation. it was unusual. almost impossible to duplicate. we want to find out exactly what happened. one of the big questions is where did the tools come from? >> reporter: construction work was being done on the inmate cellblock at clinton correctional facility. no missing tools have been reported. authorities tell abc news they have questioned joyce mitchell an industrial training supervisor at the prison. her neighbors to night among those on edge in the small community. >> me and her were scared. i want to find out what is going on. hey, i live here man. >> reporter: police say both men are serving life terms for murder. richard matt for kidnapping and killing his former boss. david sweat for killing sheriff's deputy kevin tarcia. for his fiancee, the escape has been traumatic. >> i was pretty much in shock when i heard that david sweat had escaped from state prison maximum security it was very shocking. it brought back all of the memories and all of the thoughts

and the terrible horrific torture that they have inflicted on kevin and it brought all back terrible memories of all of that. >> these guy are dangerous. these guys are two guys as dangerous as you are going to get. >> reporter: martin horn former commissioner of the new york city department of corrections an expert on what happens inside prisons. >> it could be over the years the guys have been in prison they worked on a maintenance detail prisons use the prisoners to maintain the prison everything from painting the balls to fixing the leaks to rewiring an electrical socket. and so they may well have actually been in the pipe chase area that everybody seems to be so fascinated with. >> reporter: this is far from the first time an inmate attempted a daring prison escape. take what happened in one oklahoma prison in 2013 when four inmates plotted an escape through the jail bathroom. they unscrewed a metal plate on the shower ceiling.

they then hoisted themselves up to a crawlspace. just five feet tall and three feet wide. one by one they followed the jail's plumbing system. at the end of the pipes, authorities say the men had knocked holes in the concrete they dropped through those holes to the ground floor and walked right out the door. >> this is a door that they actually came out of. >> reporter: or this decidedly more low-tech escape in arkansas the same year. when a convict jumped through a jail service window and simply made a break for it. all these escapees were eventually recaptured. which is exactly what police fanned out on this ongoing manhunt are hoping will happen and soon. >> the state police and investigator personnel and surrounding agencies are following up on each and every lead no matter where it takes us. >> the prison's isolation gives it the nickname new york's siberia. once home to famous inmates. like lucky lucciano and tupac shakur. 20 miles from the canadian

border where authorities are on the lookout. >> they should stop them at the border. no way of getting worried more than we have to. >> reporter: area schools on high alert. the community surrounding the community in new york living in fear. new york state is offering up to $100,000 for information leading to the arrest of those two escaped convicts. >> they are dangerous. and we want to make sure that -- that they don't inflict any more pain or any more harm. >> reporter: for "nightline," gio benitez, in new york. ♪ next we are heading to the pristine waters off the costa rican island on a mission to save the sharks with "entourage" actor, adrian gre nichlt er. -- adrian gre nichlt and protect my joints from further

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tonight we are celebrating world ocean day with actor grenier. you can watch him of course in theaters right now in the new entourage movie. but tonight, when an altogether different adventure for mission blue and sister network fusion he is taking the plunge into the shark-infested waters that happen to be a precious breeding ground for many species facing the threat of extinction. >> reporter: a young boy's fun day at the beach sunday turned terrifying when a shark attacked him swimming in shallow waters at cocoa beach in florida right in front of the lifeguard tower. >> the lifeguards spotted the victim in the water.

seemed in some distress. ran out found out he had a bite. >> reporter: the boy was air lifted to a hospital. he was bitten at least twice in the leg. officials are calling this one of the worst attacks there in years. although none were fatal, last year there were 28 shark bite incidents in florida alone. the shark attack capital of the world. 72 around the globe. but actor adrian grenier seemed unfazed recently as he went diving with sharks. >> hear you got something for me? >> reporter: as vinny chase in the hbo series turned motion picture, "entourage" grenier knows something of swimming with sharks having navigated the waters of hollywood. but grenier stars in a less known role as a passionate conservationist on a very real mission. >> seems like a good place to go deep. >> seems like a good place. >> yeah. this is a great place. >> reporter: from the hollywood hills, adrian traveled to cocos island preserve 300 miles off the coast of costa rica.

home to one of the greatest shark concentrations in the world. the waters fuel a thriving underwater eco system. >> have you seen sharks underwater? >> no. >> first time. >> except in movies. >> he joined fusion's environmental correspondent and a team of conservationists. >> there were sharks long before there were humans. and they are critical to the health of of the system t it's like a big computer. if you start taking out pieces it doesn't run as well. >> reporter: "nightline" profiled sylvia earl in 2013. she established mission blue to create large marine protected areas she calls hope spots. >> we are down to a tiny fraction of what did exist 20 years ago, 30 years age because we are so good at catching them killing them. >> reporter: because of its abundant resources, coco's island is a jewel of hope in an

overfished ocean, hammer head tigers galapagos, silky and white tipped reef sharks room freelien the waters a rare breeding ground for the threatened species. annest mated 100 million sharks are killed every year for their fins and meat. an unquenchable demand for shashgdz could lead to the eventual collapse of ocean eco systems around the world. >> the problem with the ocean, sure it is a problem for whales a problem for sharks and shrimp and all the bycatches. it is a problem for people. it is a problem for us. >> reporter: while humans are most certainly the cause of the problem we may also be the solution. >> protecting the ocean is the best investment we could possibly make at this point in history. >> reporter: as the the team geared up for the first dive nicholas got a quick lesson in shark behavior. >> when you go into the ocean you are going into their home. imagine going into an african savannah. there are lions. these are like the lions. you want to look around like a predator looks around.

>> do not act as a prey. >> do not act as a prey. eye contact is huge. when you are looking around. they are aware of eye contact. i don't want you to lock eyes with them too long that can be aggressive and intimidating. when you see them. look at them. then justf generally look around. you don't want to stare them down too long. >> this is the place in 1972 when i first dived cocos, 70 feet of water it looked as though some one had taken a box of the wooden matches and dropped them. and every match would be a hammer head shark. they were just all over the place. there are still hammerheads here. it isn't like it was in 1972. >> sylvia i just want to say, we have only jusmet. but i have been watching what you have been doing for many, many years, it is such an honor to be diving with you as my mentor going to be watching you first and foremost. >> we're surrounded by how many

40 50 sharks? >> a lot more than that. i would say at least 100. surrounded actually by bait fish at one point. trying to push you back pull you back. i was worried that the tuna were going to come in and bump you. the sharks are interested in the fish. they want the fish. they're coming in. they're respecting the space. you should respect their space. >> reporter: cocos island preserve is 800 miles of protected water. the team saw firsthand the trash and waste no boundaries. >> a shoe. a flip-flop. trash ahead. trash ahoy. >> you know what we need to do -- we need to change the term throw it away. because the, when you think you throw it away it doesn't go away. this is so tragic. and this is only a small piece of of big huge problem. >> illegal fishing is another problem that plagues cocos. a few months ago a park ranger

discovered a fishing line within the marine protected area. this line was two miles long. hooked were 11 sharks. and by the time he cut them all loose, eight were dead. >> this is such a rare place in the world to actually be able to see large schools of fish. >> it's not like that everywhere? >> unfortunately not. it is so overfished the world over. this is really really amazing and precious. we are lucky here it is actually a protected area. although there is a lot of illegal poaching that is something that you would want to bring future generations back to be able to see. >> i want to come back and see it. >> exactly. within our lifetime at the rate of their declining, we're not going to get to enjoy thissen enin a couple years. >> reporter: without sharks in our oceans the rest of marine life too will be threatened. >> i am hoping people have an opportunity to live vicariously through our journey and hope that they're inspired enough not only to do their part to help

protect the oceans, get riled up get mad enough about what is happening within the big industrial fishing industry it's just entirely decimating the oceans and putting the costs on to us. >> we are going to have to pay for it when the oceans collapse. we are going to have to suffer when there is no fish to eat any more. >> reporter: the message is simple. save the sharks. save the ocean. save ourselves. you can watch "shark land" at fusion.net. next is there anything she can't do? beyonce shares how she got to be flawless. ♪ we're flawless ♪ ♪ lady tell them i wok upe up like this ♪ fifteen minutes could save you fifteen percent or more on car insurance. everybody knows that. well, did you know genies can be really literal? no. what is your wish?

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beyonce may seem impossibly perfect, but tonight she is sharing how she got her body into better shape than ever thanks to a regimen she is calling revolutionary. here is maria schiavocampo. >> this is something i have to share with everyone. >> reporter: strutting down the red carpet. and stunning on stage. beyonce turns heads 24/7. ♪ now for the first time the diva is letting the world in on her secrets for slimming down and staying fit. dishing about her diet plan the 22 day revolution. >> i am not naturally the thinnest. i have curves. i am proud of my curves. and i have struggled since a

young age with diets. and finding something that actually works, actually keeps the weight off, has been difficult for me. >> reporter: the program was cooked up by her marco borgess who keeps jay-z fit. the regime include eating va inging vegan three weeks. if you adopted a them thee habit over 21 days. over the 22nd day you're armed with a new habit. that's the magic. >> reporter: his major rules, choose plants over processed. have three meals a day. eat plenty of complex carbs. limit protein and fat. exercise for half an hour every day. and last but not least, drink plenty of water. beyonce is such a fan she is partnering with him to start a vegan meal delivery service. writing in the book if a houston born foodie like me can do it. you can too. >> i felt like my skin was really firm. a lot tighter than when i,

deprive myself of food and got the weight off fast. and the weight stayed off. >> reporter: a superstar's secret to looking and feeling flawless. for "nightline," i'm maria schiavocampo in new york. >> would you go vegan for a 22-day diet? hit the "nightline" facebook page. let us know. when it comes to a healthy lifestyle, it's been said you didn't have to be great to start, you have to start to be great. thank you for watching abc news. tune in to "good morning america" tomorrow. as always on line 24/7 at abc news.com. good night, america.

oh, big mistake. he's going into the alley. my boys should be coming right...now. what? oh, you seen this one already. no, no, no. that's the way you can do it, see? first of all you set up a perimeter, right? you close off all the avenues of escape. it's like catching a mousese. hey, i've seen you with a mouse. remember this? aah!h!

remember me beatin' the crap outta you? ah, they got the bracelets on him. he ain't goin' nowhere. of course he's not the show's call cops. it's fixed. you never see the bad guy getting away. let 'em get their own show. you see the way they ran that punk down? you ever run like that? i'i've been known to. when do you run? when i have to. last time you ran was when the wind took your balloon. what are you saying, raymond? nothing. notothing. you don't think i do this? come on, this is show biz. this is 3 months of filming cut down to half an hour. what?