Crab with raised claws walking on white sand beach closeup Male Lemon-Clawed Fiddler Crabs Waving. Male lemon-clawed fiddler crabs waving ... Crab hios grabbed booty with claws underwater on seabed of ...

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Inside, the habitat resembled a modest RV, with basic amenities such as a shower, toilet, sink, dinner table, and shelves of canned food. But living underwater wasn't without its quirks.

There were three teams of aquanauts in Sealab II, each living in the habitat for 15 days. But Carpenter and one other aquanaut stayed down for 30 days. The aquanauts spent their days conducting a ...