One more fave of prepping blue crabs would be to dunk them inside a bucket of ice water for around 5 - 10 minutes. It places them to rest and anesthetizes them. We use rubber gloves to rip from the backs and it kills them instantly. Thaw the crab legs: https://frozen-crab-legs03333.blogpixi.com/32580681/the-single-best-strategy-to-use-for-crabs-live-underwater