Please direct all general questions about submarines, water pressure deep in the ocean, and similar questions to this sticky. Within this sticky, top-level questions (direct “replies” to me) should be questions, rather than explanations. The rules about off-topic discussion will be **somewhat** relaxed. Please keep in mind that all other rules – especially Rule 1: Be Civil – are still in effect.
Please also note: this is **not** a place to ask specific questions about the [recent submersible accident](https://www.npr.org/2023/06/22/1183661199/sub-titan-titanic-missing-search). The rule against recent or current events is still in effect, and is for general subjects, not specific instances with straightforward answers. General questions that reference the sub, such as “Why would a submarine implode like the one that just did that?” are fine; specific questions like, “What failed on this sub that made it implode?” are not.
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ELI5: what are the disadvantages of using carbon fibre body for deep sea subs v a material like steel /titanium? Heard this comparison from an interview with James Cameron.
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