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sail2wind said:
Without a doubt we saw a sea snake at Salt Pond, striped and colorful. Not much scares me underwater, but this was a shocker We called the local St.John dive shop and they were well aware of it and thanked me. She said they were not aggressive but a little poisonous.

And according to this site, which I believe is run by ictheologists, the sharp tail eel can mimic the stripes of a sea snake.