Titanic tourist sub goes missing sparking search

Re:Titanic tourist sub goes missing sparking search by WalterBright on Monday June 19, 2023 @03:41PM (#36395651)

Neutral buoyancy varies by depth, because water compresses. You'd have to have a tether with the same density of water and the same compressibility.

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Re:Titanic tourist sub goes missing sparking search by londons_explore on Monday June 19, 2023 @03:52PM (#36395772)

The compressibility of water is fairly negligible - the density increase is only 1% for every 2 kilometers of depth. And obviously the cable also compresses at depth - probably by a similar percentage,

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Re:Titanic tourist sub goes missing sparking search by carlosjobim on Monday June 19, 2023 @09:09PM (#36398514)

The metal wires in the tether is heavier than water. This is balanced by twining air/gas hoses into the tether. Gas compresses by 50% for each 10 metres of depth in water, so that's a whole different scale.

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Re:Titanic tourist sub goes missing sparking search by londons_explore on Tuesday June 20, 2023 @02:32AM (#36400457)

You either put floats (ie. Gas chambers of fixed volume) or sealed tanks of a light liquid, for example kerosene.

For high depth like this, tanks of a light liquid are probably most suitable. I'd probably use liquid butane. With a vapour pressure of 40 psi, it is easy to contain, and is has a density of only half of water. If it leaks, there won't be an environmental cleanup cost either.

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