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The Baltic Sea is very very shallow, with average depth of just 55 meters. It's not particularly difficult to do, sadly :(

"Fun" fact, mostly unrelated: the Baltic sea floor is full of unexploded munitions from WW2, and some (still?) contained chemical weapons.

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I'd think they would have cleared them before, instead of blindly laying some pipes in 'good faith'.

Oh I'm sure it's cleared enough around the various pipes and cables that lie on the bottom. But it's still a far cry from the entire bottom of the sea being safe.

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