i am phil torres joined by lindsey moran.ot back from one of the most exciting weeks of my life. it was all for science. here is a question for you: would you jump on a 14-foot 1-ton tiger shark? >> what i got the opportunity to do. 15 of the sharks in the name of conserving them, let's take a look. >> shark, the very name inspires wonder and fear. villefied as the world's ultimate killing machine, their bad boy image. >> i haven't had a single aggressive shark in over 35 years of swimming with them on a daily basis. >> jim abernathy owns a excuse me dyeing shop. if there is a shark, you will find jim around the water in the camera. >> 400 billion years shaping our ocean's hell. in the last 50 years in my watch, we have literally destroyed it. one of six of all of sharks that are threatened. >> dr. neil hammer slag is also sharks. he rungs the rj dunlap lab in miami policy makers can make good conservation decisions based upon science. >> really can't express the value that jim brings to a project like this. he relies on jim

lindsey moran is a former cia operative and analyst. tonight, from searching the galaxies for et to searching the rubble for human life, this is the space-aged machine that can detect a heart beat through tons of concrete. rachelle olmixon is a neuro scientist. tonight, the mystery in the waters of america's northwest. scientists try to figure out what's killing the oysters before it's too late. i am phil torres, an entomologist. that's our team. let's do some science. >>> welcome to tech know. i am phil torres. for most of us, communicating with the human voice is something we kind of take for granted but not so with some of meet. >> yeah. i was able to meet three patients that all have als. it's a devastating condition that degenrates the muscles in the body including those in the vocal cords. so they lose their ability to speak. but using technology, they were able to communicate with me in a really remarkable way, such as these stories we are working. take a look. >> on a snowy day in the of seasons, the training camp for the baltim