There is a big Tiger that hangs out at the entrance to Honokohau harbor. I’ve seen her many times while diving. Didn’t think much about it as I never act like a seal and I don’t turn my back. I did come upon a turtle that had been bitten in half!
This one maybe
https://youtu.be/MpEGVA54AoQ
Perhaps one may mistake a swiftly passing foil , on Kauai north shore ,for a turtle?