tonight on "nightline" -- honeymoon from hell. a dream vacation gone fatally awry. a new bride found dead during a romantic scuba dive. her parents suspect the groom, while he claims it was a terrible accident. tonight, the latest on the gripping trial. who's watching you? they're high-tech and tiny. and they may be flying over a backyard near you. how stealthy military drones are being used by everyone, from real estate agents to your local sheriff. and lin-sanity. the harvard bench warmer, who is no longer crashing on his

brother's couch. how the unlikely superstar is going to rake in big bucks. we go into jeremy lin's meteoric rise, as america's favorite underdog. good evening. i'm juju chang. we begin tonight with a chilling story that will have you wondering, was it love? or money? it was an exotic honeymoon that came to a horrifying end, 100 feet beneath the ocean waves. a scuba dive goes horribly wrong. the bride, lifeless on the ocean floor. the groom, on the surface, calling for help? or guilty of murder? our series, "crime and punishment." >> reporter: this home video of a happy newlywed couple packing for a honeymoon in australia, is one of the last images of tina

watson alive. their fairy tale wedding behind them, they set off to go diving in the great barrier reef. >> she was excited about her wedding. she wanted to be the princess bride. she wanted everything to be perfect. she had it planned out perfectly. >> reporter: but 11 days later, tina was dead. now, gabe watson stands trial in an alabama courtroom, accused of murdering her. with tina's parents front and center in their quest to find out what really happened to their daughter. >> this is about justice for our daughter. >> reporter: prosecutors began the trial this week, by showing jurors of tina lying lifeless on the ocean floor. as shown as in this australian police re-enactment video, the prosecution believes watson killed his new bride by turning off her air supply on her scuba tank. and holding her in a bear hug while she suffocated. and they say he turned the air back on, which is how it was found, all under six minutes.

the defense argue that scenario is impossible. and that tina's death was a tragic accident. >> two inexperienced divers, in a perfect storm, a culmination of bad facts and bad circumstances. >> i can tell at that point, she was scared before. but at that point, i could tell she was frightened. >> reporter: today, in court, the jury watched a tape about australian police questioning gabe about the dive. gabe says tina struggled to swim in the strong currents. and that she began to sink in the deep water. he said he signaled to her to inflate her buoyancy vest, to help her stay afloat, but she couldn't. he then held her hand to help pull her along. >> her hand hit my mask. it knocked my mask sideways. so, you know, i had to let go. >> reporter: gabe then says he fate a fateful decision to go up to the surface to get help for tina. >> in that split-second decision he made underwater, 45, 50 feet of water, with the current in

his face, and his wife sinking away from him, he made that decision to go for safety and go for help up on the surface. that decision, he has been second-guessed for nine years. >> reporter: but prosecutors say gabe watson has done more than second-guesses actions that day. they say he changed his story about what happened, several times. >> the fact he keeps changing his story, the fact that he's lying. >> reporter: they argue he planned to kill his new wife. all so he could collect on her life insurance policy. >> the defendant expected to gain up to $155,000 from the death benefits. >> reporter: but it wasn't gabe who was the beneficiary on tina's policy. it was tina's father. gabe watson never received a dime. there had been tension between gabe and tina's family even before their wedding. they thought gabe was cool and controlling of their daughter. >> i don't think that tina's mother thought that this was the right guy for her.

>> reporter: since tina's death, those tensions have become an all-out war between gabe and tina's family. tina's father fought to have watson charged with murder in australia. gabe watson did plead guilty to negligent manslaughter. >> the manslaughter standard he pled guilty to is an obscure australian law. which says if you undertake a dangerous activity with someone, you have a significant responsibility to make sure that they're safe. not that he killed her. but he didn't do enough to save her. >> reporter: after spending 18 months behind bars in australia, watson returned home. only to face murder charges again. >> shows that the defendant caused her death by drowning. the defendant acted intentionally in causing that death. >> reporter: australian journalist and seasoned diver, peter patrick, has been following the case for years. he says there is evidence gabe's story of what happened could be true. that tina could have panicked on this deep and difficult dive. >> she shouldn't have been

diving in that depth of water for her first dive. this is her very first time she'd been diving in the ocean. and she chose what's really a fairly significant diving event. >> reporter: gabe and tina were attempting what's called a drift dive over a century-old ship wreck. currents are so strong, divers are told not to fight them, but to pass over the ship. patrick has done them himself. >> it was a good run around the racetrack. you need a lot of skills. and you need to be prepared. >> reporter: she had just learned how to scuba in an alabama pond, where her instructor said she also suffered a panic attack, even in those calm waters. divers use more air when they are fighting currents to swim, or when they are panicking. tina's tank showed she had consumed an unusually high amount of air. >> i think the evidence of the trial will be consistent with panic and consistent with gabe's

story. >> reporter: the dive organizers on the reef that day were found guilty of negligence, by letting a novice diver go into the water. they were so convinced of gabe's guilt early on, they turned what they saw as an unemotional response, to murder. >> when he returned to alabama, he met with grief counselors. he attended a support group. he grieved. he grieved. he couldn't date. he couldn't interact socially. he was numb. and it took years for him to heal. and he's still emotional when he discusses it. >> reporter: two, starkly different portraits of gabe watson are on display. stunned, grievinged widower? or killer?

12 jurors will soon be asked to decide. i'm elizabeth vargas, for "nightline," in new york. >> after nine years, still a wrenching case. our thanks to elizabeth vargas who will follow the trial, of course. just ahead, these tiny drones are being used by law enforcement and even real estate agents. could they be flying into your backyard and spying on you? what's the matter? uh, trouble with a car insurance claim. ah, claim trouble. [ dennis ] you should just switch to allstate, and get their new claim satisfaction guarantee. hey, he's right man. [ dennis ] only allstate puts their money where their mouth is. yup. [ dennis ] claim service so good, it's guaranteed. [ foreman ] so i can always count on them. unlike randy over there. that's one dumb dude. ♪ the new claim satisfaction guarantee. dollar for dollar, nobody protects you like allstate.

the new claim satisfaction guarantee. i have copd. if you have it, you know how hard it can be to breathe and what that feels like. copd includes chronic bronchitis and emphysema. spiriva helps control my copd symptoms... by keeping my airways open a full 24 hours. plus, it reduces copd flare-ups. spiriva is the only once-daily inhaled copd maintenance treatment that does both. and it's steroid-free. spiriva does not replace fast-acting inhalers for sudden symptoms. tell your doctor if you have kidney problems, glaucoma, trouble urinating, or an enlarged prostate. these may worsen with spiriva. discuss all medicines you take, even eye drops.

stop taking spiriva and seek immediate medical help if your breathing suddenly worsens, your throat or tongue swells, you get hives, vision changes or eye pain, or problems passing urine. other side effects include dry mouth and constipation. nothing can reverse copd. spiriva helps me breathe better. does breathing with copd weigh you down? ask your doctor if spiriva can help. i love the fact that quicken loans provides va loans. quicken loans understood all the details and guided me through every step of the process. i know wherever the military sends me, i can depend on quicken loans. that's why there's crest pro-health clinical gum protection. it helps eliminate plaque at the gum line, helping prevent gingivitis. it's even clinically proven to help reverse it in just 4 weeks. crest pro-health clinical gum protection.

>> announcer: "nightline" continues, from new york city, with juju chang. spy plane. the phrase makes most of us think of distant wars. but there's a new breed of minispy plane that may be operating in your city, on your block, over your backyard. it's tiny, flying robots, equipped to take photos and

video. and it might not be long before they're a fact of daily life. the question is, what and who are they watching? here's abc's jim avila. >> reporter: it's an engineering marvel. a pocket-sized humming bird drone that can hover, do a flip and transmit everything it sees and hears from a camera microphone in its throat. this microspy plane is the smallest of an entire new industry of domestic spy planes, soon available to anybody willing to pay. from the news media, to law enforcement, to the weather service. and, yes, even realtors. >> hey, this is ed cominsky. >> reporter: drones, once our unmanned heroes in war zones are now in the hands of real estate agents. >> 45,000 square feet, priced under $2 million. >> reporter: for ed cominsky, a real estate agent in southern california, it's called a multicopter. and it's a tool to drawing

buyers to multimillion properties like this one. >> you can't capture a courtyard with still photography. we can roll through here with a camera, right up top. roll in and out the backyard. it's going to get the best perception of what this home is really about. >> reporter: cominsky says for those who can't come to an open house, it's almost like being there. >> there's a lot of foreign buyers coming to purchase real estate. especially high-end real estate. to give them an opportunity to see the whole property from a different perspective, this is allowing us to do that. >> reporter: while comisky says it only captures private homes with the homeowner's blessing, its ability to see without being seen, has some worried about privacy issues. >> there's no rules on how these things can be used. what we don't want to see is them being used all the time for mass surveillance for no other

particular purpose. >> reporter: the media is using drones. the daily and internet news site called theirs the daily drone. >> the extent of the damage is even more shocking. >> reporter: and among the most eager to fly domestic drones are america's police departments. mesa county, kra colorado sheriff's deputy, derek johnson has it in his car. >> deploy this little guy. >> reporter: it's a camera-carrying helicopter drone. it takes just moments from carrying case to flight. it's controlled by two joysticks. and can hover for up to 15 minutes over a crime scene, providing backup for s.w.a.t. teams. >> these are our two deputies trying to conduct a search. >> reporter: like it did when a stabbing suspect went running into the brush by the railroad

tracks. >> an policy for officers who are approaching this person can can't see him. >> reporter: they're easy to fly. similar to a video game. these sheriff's deputies learned at a two-day seminar. even i could keep it aloft, flying over the police parking lot at about 70 feet. in mesa county has a more sophisticated six-wing drone, too. these are the closest cousins to terrorism-fighting robot heros of afghanistan and iraq. the silent predators of mideast sky. now launching a new airline assault at the hands of domestic law enforcement. >> it's a tool for us that gives us an eye in the sky, without paying time for a helicopter. >> reporter: one of the strong points about the drone is it can find people. people who are missing. people who are hiding. even though you can't see me on the ground, to the drone, i'm purely visible. you see me?

you see me now? the faa has issued nearly 300 permits, many for law enforcement use. and is developing new rules to address the second controversy, over unmanned drones. flying over busy, domestic air space, safely. the airline pilots' association warns of chaotic, dangerous skies, if drone operators continue to learn their craft in just days. they want full pilot training. >> without that, there's a potential for a drone to run into an airplane. >> reporter: making the new domestic drones as unintentionally dangerous to americans and their privacy, as they are potentially lethal to terrorists overseas. for "nightline," i'm jim avila, reporting from grand junction, colorado. >> cool or creepy? you decide. our thanks to jim avila. next up, the lin-sanity continues, as the underdog-turned-superstar. jeremy lin help the knicks notch another victory tonight, in his

jeremy lin help the knicks notch another victory tonight, in his lin-creditable story. with a se the jeep grand cherokee's performance for specific weather and road conditions, even heavy snonowstorms won't keep you from getting to work... our apologies. happened to come across quicken loans online. [ chris ] quicken loans constantly kept us updated and got us through the process twice now. quicken loans is definitely engineered to amaze. they were just really there for us.

a little bird told me about a band... ♪ an old man shared some fish stories... ♪ oooh, my turn.

♪ she was in paris, but we talked for hours... everyone else buzzed about the band. there's a wireless mind inside all of us. so, where to next? ♪

as an asian-american mother whose son, well, two of three of them anyway, play basketball, i shudder to think that the new tiger mom credo, might be study hard, go to harvard, and play for the knicks. jeremy lin's exploits on the court continue tonight, not just to defy, but to shatter all expectations. he made crashing on your brother's couch, chic. here's abc's john berman. >> lin puts it up. bam. >> reporter: just how big is jeremy lin? just how surprising? just how inspiring? he's like the perfect combination of shirley maclaine, eminem, and mark zuckerberg, all rolled up into one. we'll explain. but first --

>> lin, alley-oop. >> reporter: tonight, lin led the new york knicks into their seventh win in a row. if you're not familiar with the fairy tale, jeremy lin is the world's unlikeliest current nba star. unrecruited by big universities. undrafted out of college. cut by two teams this season. he's sleeping on his brother's couch in new york, before leading the knicks on a winning rampage. >> banks it in. wow. >> reporter: averaging more than 26 points a game. now, he's moved into a posh trump building. he's a devout christian. and also one of the first american-born asian players ever. and the first from harvard since the 1950s. an economics major, by the way. simply put, this has never happened. not to mention, this, the absolute mania over his success. >> lin-sanity. >> reporter: courtside seats for the knicks can now run you over

two grand. official t-shirts and jerseys are completely sold out. and he has hundreds of thousands of twitter followers in just a week. it got taiwanese animators drawing adoring cartoons. and spawned more punnish headlines than the world should ever see. >> i didn't know you could turn lin into so many things. >> reporter: so, how is he like shirley maclaine? it's not that he's a fan of post arts from the edge. as far as we know. but in the 1950s, mcclain was a nobody. but the star got hurt. she filled in. now, she has one academy award, and past lives. shirley maclaine and jeremy lin came from nowhere. that brings us to eminem. we know he embodies eminem's

"loose yourself." ♪ one moment >> reporter: jeremy lin captures the heck out of his one moment to seize everything he wanted. >> i've loved basketball ever since i was young. that's all i really wanted to do was play basketball. >> reporter: how about facebook founder mark zuckerberg? well, they both went to harvard. but here is where lin might have accomplished his most unlikely feat. turning his brand, into an underdog. maybe his father. he taught him how to play basketball by showing him tapes of kareem abdul-jabbar. maybe it's his smile. the enjoyment he gets from the game. maybe the humility. >> thank you for the energy, as always. we love playing here. >> reporter: in the end, the fact of the matter might be this. if you can't root for jeremy lin, that's simply lin-sane. i'm john berman, for