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All the ones shown I know have been crossed via swimming. I know Oahu to Molokai is 26 miles. Mostly for records, so it's definitely not a common thing. It's a bit more difficult from what I hear compared to other channels due to being warm water.
One swimmer got attacked by a cookie cutter shark while swimming between islands at night. Only recorded attack on a person. They rise from the deep water channels at night, and the channels themselves are popular spots for large marine mammals like whales and dolphins.
