there will likely now be multiple investigations. paula newton is joining us live from halifax. and what will investigators focus on now? reporter: they will focus on whether or not this was a catastrophic event that entailed just one thing going wrong or if this was multiple things given the strain on that vehicle. remember, we had heard that there were quite a few successful expeditions to the titanic wreck, was there stress put on the titan which then because it was largely unregulated wasn t tested going through the motions. you ve had so many people weigh in on this and one is james cameron who he himself has been to the wreck of the titanic and other deep sea explorations. listen to him now. i think there is almost a surreal irony. the titanic sank because the captain took it into an ice field on a moonless night with poor visibility after he had been repeatedly warned by telegram, by are a during t b are a during the day that that is what was ahead. and so a p
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 investigation of the submersible and its implosion. the discovery of debris confirming everyone s worst fears, that the underwater expedition to see the ruins of the titanic had a disastrous end. our correspondents are at key locations covering the story from every angle. first, i want to go to miguel marquez who s in newfoundland. the debris field was found just off the coast of canada where you are just
see the wreckage of the titanic. this hour the supply of oxygen is rapidly running out. we ll show you what conditions are like inside the small, cramped sub that left with five people on board. china is now lashing out at the united states after president joe biden referred to chinese leader xi jinping as a dictator. this as cnn is getting an exclusive look at military drills preparing for a potential chinese invasion of taiwan. welcome to our viewers in the united states and all around the world. you re in the situation room. let s get right to the massive search for the missing submersible. the source of banging sounds in the area remains a mystery at this hour but they are giving rescue crews hope. when you are in the middle of a search and rescue you always have hope. that s why we re doing what we do. reporter: with what could be less than 24 hours of oxygen left onboard titan, hope at this point may rest on banging noises detected by sonar. the coast guard re
reporter: and it often brought controversy. submersible industry leaders as well as some former employ years of oceangate claimed that he was dismissive of regulations and safety standards. he once said we risk capital, not people. and he always seemed to have an eye on the future. the future is understand water, not on mars. we won t have a base on mars or the moon. we ll waste a lot of money. but we ll have a base under water. reporter: and paul-henri nargeolet had earned the nickname mr. tit titanic becau of his 30 plus dives over to the wreckage. and he is absolutely passionate about it. and the great thing is he is humble and he is not arrogant like some of the 2308 beings in t folks in the business. reporter: and this was not the first adventure for hamish harding either.in the business. reporter: and this was not
to pursue his vision of deep sea travel. stockton rush once said he wanted to be remembered azine innovator. two years ago he explained to allen astrauda his mind-set while constructing the titan submersible. i think it was general macarthur who said you re remembered for the rules you break. i ve broken some rules to make this. reporter: submersible industry leaders as well as some former employees of asiangate claimed he was dismissive of regulations and safety standards. rush once countered hid critics by saying, quote, we risk capital, we don t risk people. the future is under water. it s not on mars. we re not going to have a base on the moon. we ll try and waste money. reporter: 77 french explorer paul henry nargeolet had earned