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Saruman: You fear to go into those mines. The dwarves delved too greedily and too deep. Me, a coastal science researcher: Deeper than the knee height of the shortest person in their group?!

anyway if you want to know more than you ever thought you could on how one dies from digging holes on the beach, this is the article for you

Perspective | There’s real danger in digging deep holes on a sandy beachwww.washingtonpost.com Experts recommend never digging a hole deeper than the knee height of the shortest person in your group — with two feet being the maximum depth.

Things you learn when you play dwarf fortress on a sandy coastal start