[ cheers and applause ] tonight on "nightline" -- as we go on the air, new clues in the search for that missing malaysia airlines plane. tonight the latest theories about what could have happened to flight 370. could it have landed somewhere? who might have been involved? and could this be new video of the pilot himself? we're with investigators asking, are they finally closing in on answers?

plus, j. lo has it. kanye likes it. we're in the beauty capital of the world, where the price of perfection could be downright deadly. r these young women it is nevebig enough. why they are risking it all on bootleg butt injections. and one of hollywood's favorite fashion designers and mick jagger's girlfriend found adead in her apartment. what happened to this bubbly beauty? >> keep it right here, america. "nightline" is back in just 60 seconds.

good evening. as we come on the air tonight, the mystery of flight 370 is evolving in new ways, ranging from the intriguing to the downright baffling. there are fresh clues, expanded

search zones, and allegations of deliberate misinformation. tonight abc's david wright is in australia taking us inside the investigation, exploring the latest theories and separating fact from fiction in this enigma that the whole world is watching. >> reporter: grainy footage of a routine airport security check, all over youtube today. could this be the pilot and co-pilot of malaysia airways 370 moments before they boarded the plane? that flight is now the focus of the biggest aviation mystery since amelia earhart. today nearly ten days after the boeing 777 vanished the search area has expanded, most of it shimmering ocean. >> from the cockpit this ocean seems endless and it feels like an inch by inch search. >> reporter: abc's gloria riviera had a front row seat for ten hours of searching today, searching in vain. on the ground perth on the west coast of australia has become a central staging area. 26 nations are now involved in

the search and rescue. you're at pierce air base. they'll be spearheading the effort as it reaches into the southern reaches of the indian ocean. aviation experts tell us that's the most likely place this plane ended up. but the thing is no one can say for sure. >> reporter: this in an era when technology is not supposed to let things simply disappear. least of all a jumbo jet with 239 souls on board. but so far instead of answers it's become a real-life episode of "lost." a mystery in danger of unraveling into conspiracy theories. could the plane have landed somewhere? were the pilots involved? could a catastrophic failure have incapacitated everyone on board? here's what we do know for certain. flight mh370 took off from kuala lumpur at 12:41 a.m. bound for beijing. 1:19 the cockpit checks in with the tower one last time. "all right. good night," he said. today we learned that last radio transmission most likely came from this man, 27-year-old

co-pilot fariq abdul hamid. >> initial investigation indicated it's the co-pilot. >> reporter: shortly after that the plane's transponder shut off and the airliner turned sharply west, a maneuver one source tells abc news was preprogrammed into the flight plan. the last clue came nearly seven hours later. 8:11 a.m., when a satellite over the indian ocean picked up a ping from the missing plane, showing not its exact location but its distance from the satellite, creating this huge search area and three unanswered questions. could flight 370 have landed? it's possible. the northern route has plenty of landing sites. but authorities say it would have been next to impossible that no one would notice. >> i know the concept or hope of the airplane landing somewhere keeps coming up. that seems very unlikely to me. mainly because it's a big airplane with 200-some people on board. if it landed, what do you do with all these people.

they have cell phones. they'd be communicating. >> reporter: the southern route, too, has a dizzying number of air strips. all of those little red dots. some of them on remote islands not much used since the vietnam war. a boeing 777 would need about 4,000 feet of runway to land. most of these, too small. >> i haven't seen any land masses out there big enough to land the airplane on. >> reporter: another theory. were the pilots involved? over the weekend authorities searched the home of captain zaharie ahmed shah, seizing a flight simulator they found there. the co-pilot, too, is being looked at closely, especially since it was his voice last heard from the cockpit. sources tell abc news there is considerable evidence of human intervention in the path the flight took. >> based on the movements of the aircraft and what's been happening, a deliberate act seems more likely to me than a mechanical failure. >> reporter: finally, what about catastrophic failure? the plane out of control, on autopilot until it ran out of

fuel. the pilot and the passengers somehow incapacitated, unable to stop it or call for help. >> the plane is monitored by flight computers that will keep the airplane in a stable state. it's protected from severe banks to keep the airplane from spiraling out of control. and these protections that are built into the airplane may very well protect a pilotless plane in a situation like this. >> reporter: for the families this is not just a cliff-hanger. it is agony. >> it's hard because -- because we need answers. we need answers. >> reporter: american james wood's brother phil was on flight 370. phil wood's cubicle in kuala lumpur now decorated with paper cranes. his brother james keeping the faith by recalling phil's favorite quote from the bible, "be still and know that i am god." >> if he's listening, phil, i love you. and keep the faith, brother. >> reporter: for now there is no answer back. only stillness. despite the frantic search for

answers. i'm david wright for "nightline" in perth. >> our thanks to david wright. and we here at abc news will continue to cover this story. coming up next here on "nightline," we're in the beauty capital of the world documenting what has become a deadly obsession for some young women. bootleg butt injections. [ male announcer ] this is the age of knowing what you're made of. why let erectile dysfunction get in your way? talk to youroctor about viagra. ask if your heart is healthy enough for sex. do not take viagra if you take nitrates for chest pain. it may cause an unsafe drop in blood pressure. side effects include headache, flushing, upset stomach, and abnormal vision. to avoid long-term injury, seek immediate medical help for an erection lasting more than four hours. stop taking viagra and call your doctor right away if you experience a sudden decrease or loss in vision or hearing. this is the age of taking action. viagra. talk to your doctor. if your doctor decides viagra is right for you, you can fill your prescription at your pharmacy.

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in the iconic rap song "baby got back," sir mix a-lot professes his love for women with large rear ends. since that song came out in 1982 the world's obsession with plus-size back sides has only intensified thanks to icons such as j. lo and kim kardashian. this can of course be a funny topic. but for some young women chasing this beauty ideal has actually become deadly. here's abc's mariana van zeller. >> reporter: chasing the ideal body has always come at a price. but here in caracas, venezuela,

we knew we were crossing over into the dark side. we're looking for a doctor who runs a back room butt clinic out of his apartment. we'll call him dr. gotz. he asked us not to use his real name, but he is a medical doctor. he does cut-rate butt lifts in his cluttered home because they're not legal and gotz believes they should be. which is why after months of contact he's agreed to let us film what he does. >> [ speaking spanish ]. >> reporter: and what he does, though considered so dangerous it's also banned in the u.s., has become very, very popular. naturally curvy stars like beyonce along with the likes of j. lo and kim kardashian have helped make the bottom a go-to

fashion accessory. and in caracas, the extreme beauty capital of the universe, the protruding posterior is everywhere you turn. we came here to the local market. somebody told me venezuelan mannequins have big butts, but i definitely wasn't expecting as big as this. look at that one. one of his patients has agreed to let us follow her. her family has begged her not to do it. over the past year in caracas at least 17 women have died from botched butt injections.

>> reporter: and when we meet her at dr. gotz's for the surgery, it's actually not her first time. she was here four years ago when she was 16 years old. she's back because she feels it's not big enough. >> why are you here today?