How do you kill crabs quickly?

Online Answer
Crabs can be killed by rapid destruction of both nerve centres by piercing both ganglia from the underside of the crab with a pointed spike (e.g. a thick, pointed pithing instrument, an awl or a sharp-pointed knife). Spiking must not be performed on lobsters because they have a long chain of nerve centres..
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First of all, the vinegar will reduce the boiling point of the water present in your steaming pot, thus helping you to steam your crabs quickly. It will allow you to serve the crabs in a better way whenever you are in a hurry.
5.) Once the water has started to boil again, reduce the heat and simmer for the required time. The cras shell should turn a bright orange when done..