arizona. cnn's casey wayian and his cameraman went inside to give you an up-close look. >> this is the way angents first discovered this tunnel a few days ago, under this giant container of water. over here, you can still see 55 gallon drums that contain the dirt that was dug out of this tunnel stretching 240 yards across the u.s./mexico border. >> this is the most vice cane one i've ever seen in arizona. >> why is that? >> most tunnels we have under arizona, those are just digging through dirt to get into the sewer system. using the sewer system and punching out again. this one, when you look down that hole, you see it is completely four by six all the way, play wood all the way around it. rebar in there reinforced. >> the tunnel is so narrow and so deep, cnn foet why journalist and his camera needed to descend separately. >> clear the shaft.

>> clear the shaft! >> okay. >> each with the help after harness. >> it gets even smaller? ? >> it gets smaller toward mexico. we actually have to crawl to get much further. >> there is absolutely in dirt in here. it is very clean. and there is light. there is electricity. and there's a fan even. >> u.s. authorities have found 156 cross-borer tunnels since the early 1990s. lately they have become more sophisticated as drug technology above ground improves. >> agents have had this area under surveillance since january. the way the tunnel was discovered, safety offices pull offered a pickup truck on the highway north of here, discovered 39 pounds of methamphetamine, after interviewing the occupants of the truck, they linked it to this facility and they now have three suspects in casey. casey wian, cnn, arizona. >> here is a question for you. are you tired of seeing your smart phone die half way through

your day? ways to extend your phone's battery life. and if you have to go out today, just a reminder. you can continue watching cnn from your mobile phone or from your desktop. go cnn.com/tv. so i can get three times the coverage. [ chirp ] [ manager 2 ] it's like working in a giant sandbox with all these huge toys. and with the fastest push-to-talk... i can keep track of them all. [ chirp ] [ chirp ] [ male announcer ] upgrade to the new "done." with access to the fastest push-to-talk and three times the coverage. now when you buy one kyocera duracore rugged phone, for $49.99, you'll get four free. visit a sprint store, or call 855-878-4biz. [ chirp ]

are you using your smart phone to text, listen to music, search the web, listen to cnn all while on the go? that can take a toll on your phone's battery life. mark joins us now via skype from toronto with ways to extend your smart phone's battery. all right, mark, good to see you. >> you too, fred. >> so there are a lot of dumb-dumbs like me who have the smart phones and have no idea there are features we need to manipulate bet per sop i get the brightness of your screen. turn that down a little bit, that may be one tip to saving your battery. >> okay. so you cut out sec, but i think your first tip was dimming the brightness. if you can hear me then great we are back live again. that's the first thing to do. you dent need your phone's screen on super bright. because the brighter the screen, the faster it will drain the battery. so that the first thing you will want it do is just dumb it down a little bit, maybe half brightness or quarter brightness

and you are good to go for the di. >> okay. then, why do i not know what you me mean, what is a push notification? what is that. >> a lot of apps or software that we use on your favorite smart phones send you information. could be for example a sports app that pushes live sports scores to your phone. like if you're a fan of the yankees, it will tell you when they've got another run. or an e-mail can be pushed to your phone instead of you logging in to pull it down. the more apps that push information to your phone, the faster your battery is going to drain. and not all of your apps need that push notification turned on. it is very easy to turn them off. can you go to your options were settings menu and manually tick off which apps you really need to know about when there is a change. like a new level in video game. i think can you wait until you log on to play before you read that there is a new level or someone beat your high score. >> oh my goodness. okay. if you have wireless like gps, wifi, turn it off?

uh-oh. did we lose mark? oh, i didn't mean to turn off our mark, on our skype there. looks like we lost that connection with him. hopefully we can get him back and he can help us out and figure out how to navigate our smart phones so we can maximize that battery life. how about other tech ideas you might have or even reviews from mark salzman. you can follow mark on facebook, twitter and linkedin. when you see the wound, you will wonder how this man survived. that's a knife blade right there embedded in his neck. we will tell you how it got there and how lucky he is to be alive.

a massachusetts prison guard is lucky to be alive today. he is recovering after an inmate stabbed him in the neck with a home played knife. inmates call it a shank. look at the x-ray right there. doctors say the blade barely missed his spinal cord by a half cent meter. the surgery to remove the knife took six hours. he and two other unarmed guards were monitoring 93 inmates when he was shanked. in a terrifying car crash in new jersey, captured by traffic cameras, set up to actually catch people who run red lights. the car driving towards the camera does just that as you are about to see. after running the light, hitting another car, then going airborne then crashing into that median. and you will see it again. the driver suffered minor

injuries and was arrested for drunk driving. fortunately no one was hurt. officials released the video to show the dangers of running red lights. in south africa, many hoped that life would improve for everyone. unfortunately, some of the slums such as clifftown have been left behind. dif's cnn hero is doing all he can to help the community's next generation. >> kliptown hasn't changed. there is no electricity. people are living in shacks. growing up in kliptown makes you feel like you don't have control over your life. many children drop out of school because they don't have school uniforms and textbooks. i realize that the only way that kliptown could change is through education. i'm helping the children so that we can change the town together.

we help the children by paying for the school books, school uniforms. we have a program that we run four days a week. as young people born and raised here, he know the challenges of this community. and we also do a number of activities. we've got to come together for fun, and also come together for academics. >> this program gave me a chance to go to school and pay for my fees. that's why i come back and volunteer. a little can go a long way. >> what's up? what's inside? thank you, yeah. >> i did not go to university. but being able to help them, i feel excited. >> i am going to be an accountant. >> i'm going to be a lawyer. >> i'm going to be a nurse. >> yes. >> the work you do here is bringing change.

>> and remember, all of our heros come from your nominations. if you have someone you would like to tell us about kwb go to cnn heros.com. all right, a little internet problem. mark, while talking about smart phones, guess what, he is on smart phone which is why we will be able to continue talking with him next. man: there's a cattle guard, take a right. do you have any idea where you're going ? wherever the wind takes me. this is so off course. nature can surprise you sometimes... next time, you drive. next time, signal your turn. ...that's why we got a subaru. love wherever the road takes you. in here, every powerful collaboration

is backed by an equally powerful and secure cloud. that cloud is in the network, so it can deliver all the power of the network itself. bringing people together to develop the best ideas -- and providing the apps and computing power to make new ideas real. it's the cloud from at&t. with new ways to work together, business works better. ♪

all right, before the break we were talking to mark salzman

via skype. we were talking about how to extend the battery life of your smart phone. and guess what? mark is back on a smart phone. let's talk about these wireless radios. we are talking about wireless technology like gps and wifi. you want to turn it off. don't keep it on all the time? >> that's right. so by default, most of them are on always on your smart phone like blue tooth or gps or wifi or nfc that lets you make foebl payments on a terminal at a retail store. if you are not using many or most of those wireless radios under the hood of your smart phone, turn them off. because the more radios that have you on, the faster the battery will drain. so definitely go into your options or setting menu and turn off the ones you don't need. >> sometimes you're on an app and you think you exited that app but come to find out you haven't. that eats up a lot of your battery juice too. >> yeah, so the iphone is a big culprit for this one.

people press the circle button at the bottom of the iphone and they think they exited out of the app which in fact it might be running in the background. for example, if you are using gps and you get to your destination so you push the circle button to close it, you might hear a half an hour later, turn left in 500 feet, because it is still on running in the background. so with an iphone, and again, there is where a lot of users experience it the most, you double tap the home button. you will see apps that are open at the bottom of your screen. press and hold to close those apps. it'll preserve your battery life a lot more. >> wow. and you say lock your smart phone. is that just turning it off completely before you put it away? >>. [ inaudible ] >> uh-oh. >> a lot of us are guilty of it. when you put your smart phone away, whether in your purse or pocket, there is usually a hard button, like an actual button on the smart phone that you can press that will prevent you from accidentally calling somebody,

you don't want it pocket dial someone. that could be embarrassing. for the purposes of our discussion, using the phone when you don't mean to, your pocket might play a song and now you have your play list playing for a couple hours and that takes a toll on the battery. so the last tip is an easy one but one we often overlook, just press the lock button which should be somewhere around the smart phone. then put it away. that way you can preserve battery because you are turning off the phone from you actually touching it. >> all right, excellent. mark, thanks so much for dialling back in. and this time using the phone that you have the batteries charged on. so smart and clever. >> have a great weekend. >> you too. so for more on great high-tech ideas and reviews, from mark, go to cnn.com/tech where you can follow mark on facebook, twitter and linkedin. in this week's human factor,

cnn chief medical correspondent dr. sanjay gupta introduces us to a social worker who always dreamed of helping cancer patients but richard deckens never imagined he would have to fight his own battle with the disease. >> first, just take three deep breaths. >> richard deckens is a social workers whob works exclusively with cancer patients. here he's using meditation to help patients cope. >> it really is just calming the body and quieting the mind. >> he knows all too well the emotional struggle of being sick. as he was looking forward to graduate school to become a social worker, he got devastating news. >> i got the invitation to columbia university and my number one choice on a monday. and a cancer diagnosis the next day. >> at 37, he was diagnosed with advanced nonhodgkins lymphoma.

he underwent six months of aggressive chemo and bone mare why transplant. but didn't give up his dream of helping others. >> i wanted to work with cancer/aids patients. >> during his illness he stumbled across cancer care. it helps people with the emotional and financial maze that goes along with cancer. >> riding on the new york city subway to my doctor's appointment i look up at the advertisement and it was for cancer care. i learned a lot from other people, felt safe sharing that. >> once in remission, he was able to start grad school at columbia. >> well, we do have a very small grant. >> after graduating, he began working for cancer care. and started to run the very support group he previously participated in as a patient. today, he's cancer care's mind body project coordinator. >> my life is definitely very rich, very rewarding and i feel i'm where i'm supposed to be.

and people keep coming back. so i am confident that they are getting a lot from me. and i hope so. >> dr. sanjay gupta, cnn, reporting. >> all right, so. richard considers himself cured now. he shares his thoughts on his journey. his blog chuck find at cnn health.com. [ buzz ] off to work! did you know honey nut cheerios is america's favorite cereal? oh, you're good! hey, did you know that honey nut cheerios is... oh you too! ooh, hey america's favorite cereal is... honey nut cheerios ok then off to iceland! begins with back pain and a choice. take advil, and maybe have to take up to four in a day. or take aleve, which can relieve pain all day with just two pills. good eye.

comic book lovers, sci-fi and pop fans are in san diego this week. you know why. it is the annual comic-con convention. you see them here. a lot of them dressing atheir favorite characters and of course they have panels of experts talking about lots of interesting stuff. especially the all important question. what is the future of comic books? and you know, our movie critic,

gray drake, is always out of this world. today she is really taking it to the extreme. should i say judy jetson is joining us from comic-con? >> reporter: i was so overjoyed when i heard a rumor that came true and i found rosie! come on in. the. >> judy jetson at comic-con, san diego. >> reporter: this is why comic-con is unbelievable. i was here by myself and now i have my amazing ma i d by my side to clean up my mess and now i don't have to litter in san diego. >> what is happening in general at comic-con? the characters are out from every genre of television, film, sci-fi, you name it. >> reporter: yes, everyone is here and walking the halls is like a feast for your eyes. not only because half of them are half naked, okay. but you've got superman, you've got guys from game thrones, men

in kilts, guys in crazy rainbow wigs. every character you can possibly think of and people that just like putting on ridiculous costumes just for fun. it is fantastic. comic-con is affectionately known as nerd prom. we all come here and day to day maybe we feel like a little lonely. and we're kind of by ourselves because nobody else likes to put on pink pvc latex. but you can show up here and you're among family and then you find people like this. oh, rosie, i'm so glad you're here. comic-con is my dream come true. i get all the movie scoop and it is super exciting. like yesterday they had, they premiered footage from the "twilight" dawn final film. this is part two. like the fifth movie in the series. the cast was all there. we get to see footage from the film. it is going to be bonkers. i'm not even a huge fan of that

series, if you recall, i don't review them very well. but i think this last movie might totally change my mine. comic-con wins again. >> oh, my gosh! now let's talk about something else that may be at the theater for a lot of folks this week. ice age, continental drift. what do you think? tell me about it. >> reporter: well, my that's on activity is going to be squelched just a little bit when i talk about "ice age 4." i did like it on the level that it teaches kids that woolly mammoths and sabre tooth tyingers do exist together in history which is a bonus. it goes in that back doorway that they don't know they're learning. but it was a pretty thin premise to begin with. and now four films later, they haven't really taken it anywhere. so this most recent film, it's not very funny. and it really just ends up being a lot of action pieces followed by other action pieces linked together by a couple lines of

lousy dialogue. i was bummed out. >> a little frozen in time for you. what was your grade? >> reporter: oh, as an adult watching a kids film, i had to give this one a d. your kids are going to be entransed by the action. it never stops in this film. as an adult, you might as well skip the cost of the ticket. it is just -- >> maybe you have to find the kid in you to really appreciate it. >> reporter: um, i generally don't have a ton of trouble finding the kid in me. >> i realized that when i said it. who i am a talking to? she is so funny, that grae drake, i mean judy jetson. you can get all of grae's, i mean judy's, reviews at fan dango.com. negotiations to win the release of two americans kidnapped in egypt. that's intensifying. we'll have the latest information. a live report from egypt at the top of the hour. le.

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. now an inspiring story from oklahoma city. a mother who lost both her arms and her leg to a bad infection is now regaining her independence. dana howard had her limbs amputated less than a year ago. now she can drink water and use this prosthetic hand. >> squis ever squeeze it a little tighter.

okay. good. >> yay! >> thank you, god. >> that's good crying. let it go. >> wow! what an incredible moment of doctors say she still has a lot of recovering to do. her family is hoping the donations will help them buy a special van to help her get around. all the best to her. you're back in the cnn newsroom. their silence today, the flame of a massachusetts man kidnapped in egypt. a group of bedouins captured the pastor along with another american tourist and their egyptian tour guide yesterday. it happened in the country's sinai region. his family says they are pray