sound of the implosion, and when it may have occurred. late today, the coast guard revealing a remotely operated vehicle discovered five major pieces of debris, 1,600 feet from the wreckage of the titanic. roughly 2 1/2 miles down on the ocean floor. the coast guard says all indications suggest a catastrophic implosion, possibly at the moment contact was lost five days ago. families of the passengers notified immediately. the search for more debris continuing at this hour. growing questions about safety. the concerns about tiny cracks in the sub worsening with each dive. and the abc news exclusive, two of the world s fore most experts on the titanic, robert ballard and james cameron, here tonight. discussing a second tragedy at that very same famous site. i m struck by the fact that somehow individuals, companies, have attack on the largest nuclear power plant in europe. our team with the medical units on the front lines. what our ian pannell witnessed inside the trauma hos
engineering reasons. i didn t believe in them. i certainly believe in the principle of certification for any sub that s going to take passengers. i believe there is a place for truex mror ration at the cutting edge of engineering, but it s got no place when you re taking paying passengers to a known site like titanic. whit: and bob, you knew some of the people onboard this vessel and those associated with this sub. how does this tragedy impact you personally and the community of explorers you re apart of? well, i ve known stockton rush since he was very young. i met him through his father, actually, i would say, 20 years ago. and i remember him seeking me out at various times about his dream to go down to the titanic, and obviously he was following his dream and it led to a nightmare. exploration is always risky. climbing a mountain is risky. and people are people will take those chances, but i think you mitigate that risk