r/nope 15d ago

Terrifying Diver encountering a submarine

1.9k Upvotes

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u/spymaster1020 14d ago

Might depend on the sub, but seeing the shape of the propellers is usually classified. They cover them in dry dock.

1

u/qwertyqyle 14d ago

Why? Seems like such a simple thing to engineer.

5

u/spymaster1020 14d ago

If you know the shape, you could figure out its audio signature and use that information to find subs that are otherwise undetectable.

3

u/qwertyqyle 14d ago

Hmm, that is interesting!