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implosion of the titanic bound sub deepening as one man speaks out to tell his story. plus, inside the implosion, we'll tell you what the catastrophe might have looked like under water. i'm here with a friend of those on board to talk about the warning signs he heard himself. and tanks on the streets of moscow tonight. russia breaking into state television with an urgent message. now the head of russia's private army accused of attempting a coup. let's go out front. good evening. out front tonight a new mission to the titan debris field underway at this hour. the robot that fou...

Humans have little understanding of what happens beneath the surface of the ocean. Community members at UCSB are exploring the depths of it with scientific diving.

Screen are returning from their mission to find the titan sub and debris field. we're learning about the warning signs before the titan's trip. renowned explorer and diver victor viskovo is here with me now. you're the first person to have reached both the very top of all the world's continents and the very bottom of all the world's oceans. the deepest trenches. there's a few you still want to go through but there's little have you not done. so you love doing it. you had an opportunity to go on the titan to see the titanic recently. you turned it down. how come? >> well, my own operations divi...