What is this thing?

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Found this when snorkling in Greece about 17 years ago when i was just a kid. Always wondered what it was... Anyone an idea? Almost certainly made of metal and i think it is hollow on the inside. (lemmy.world)

submitted 8 hours ago by [email protected] to c/[email protected]

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[–] [email protected] 4 points 4 hours ago (1 children)

Wow, that’s pretty clever.

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[–] [email protected] 5 points 4 hours ago

Physics, yo

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