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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 gu ....
Spacecraft and submarines is that many issues are almost identical. for example on life support you have to add oxygen, scrub out the co2, manage the total pressure, you want to keep the temperature within livable range. that sort of thing. then when you get to the pressures involved the two types of vehicles deviate dramatically. in the case of a spacecraft you re only having to hold in one atmospheric pressure compared to the vacuum of space. when you are going down, down to the mariana trench it is a thousand atmospheres of pressure. here at the titanic it is merely about 500 times the surface pressure of air. which is still obviously an enormous amount of pressure and that is why a spaceship hull is very thin, not much more than a coke can, but it takes numerous inches of steel or in this case carbon fiber to hold out the enormous pressure. plus the design is, you know, a spacecraft has often a more complex shape. ....
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 ....
Shrink. we are very aware of the time sensitivity around this mission. reporter: experts still hoping the sounds are from those trapped onboard and the resources deployed can effect a rescue. it is encouraging there did seem to be a pattern to it. we ll continue to hold out hope. reporter: the vessel was headed to view the titanic wreck that sits nearly 13,000 feet deep but lost contact on sunday just 1:45 into its descent. five onboard including oceangate ceo and founder stockton rush. i d like to be remembered as an innovator. i think it was general macarthur said you re remembered for the rules you break. you know, i ve broken some rules to make this. i think i ve broken them with logic and good engineering behind me. reporter: now questions surrounding the safety of the vessel, which was not inspected and classed by an independent group that sets safety ....
Certified by an industry group. the author of the letter, will conan, told me today in an interview that without those certifications it would not be safe to take a vessel all the way down to that titanic as he put it he said there are only ten submarines in the entire world that can handle that type of dive more than 12,000 feet. he said titan is the only one not certified. he said he brought the concerns to stockton rush and they talked over the phone and he said in his words the two just agreed to disagree. we do know in 2019 oceangate put out a blog post really defending their decision saying that the certification process for titan could have taken years. it could have stifled innovation. and they really didn t feel like the safety benefits out weighed what it could cost them. it wasn t just the experts who had concerns. it was former employees as well. what did they say? correct. jason referenced and our ....