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debris from the vessel discovered not far from the crew's planned destimation, the wreckage of the tay tannic. we have deep sea experts standing by. we'll also be taking a closer look at the five people onboard whose families and friends are now grieving. we'll be joined by guests who knew several of the passengers and understood their love of exploration and adventure. welcome to our viewers here in the united states and all around the world. wolf blitzer is off today. i'm alex marquardt, and you're in the situation room. tonight the coast guard says it is continuing its investiga...

Were doing so many exploration trips and pushing the limits, and the way this happened was so unfortunate, and we feel for the families, but in that sub was a sense of exploration and more experience in there than -- than you can see anywhere else in the world. >> we certainly do feel for the families today. aaron, in terms of figuring out what happened, the coast guard is saying this is catastroph recollect implosion. both ends of the pressure hull, the bow and the tail found in separate places on the ocean floor or at least spot. what does that indicate to you about what may have caused this...