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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. ....