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] 16 points 7 hours ago (2 children)

It’s a Sea Doobie

[–] [email protected] 15 points 6 hours ago (1 children)

What does a sea do be do?

[–] [email protected] 17 points 5 hours ago

fred

[–] [email protected] 2 points 4 hours ago

Thank you, i will never stop calling it that now!