Reply to Tourist submersible missing on visit to Titanic

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[quote=Anonymous][quote=Anonymous][quote=Anonymous][quote=Anonymous][quote=Anonymous]The fact that they can’t communicate and haven’t surfaced points to a hull breach.[/quote]

I would assume the hull had strain gauges. If there was no communication and no report of hull failure, most likely there was a power failure of some kind and the back up (if there was one) didn’t engage. Could be battery failure or electrical issue.

In that case, I would assume it is adrift and without power, too cold for survival. [/quote]

ok for those of us without knowledge of this kind of vehicle - what is a hull gauge?  I honestly wouldn't assume they had one though....[/quote]

It’s a device that measures strain, which is a measure of how much a material deforms linearly. It’s the change in length of a material divided by the original length. The crudest version would be a wire fixed at both ends that snaps when stretched too long. In this case, the gauge would measure how much the hull is compressed compared to its original size. All ships and planes have strain gauges and stress gauges (stress is the force on materials that leads to strain) so that a rudder doesn’t snap off unexpectedly.

If the submarine had one, any excessive would be signaled via its communication system. [/quote]

Unfortunately, carbon fiber is brittle. It can fail unexpectedly.[/quote]

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