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Surprised this hasn't been mentioned before but here goes.
Carry and modified Powerhead if you are seriously concerned. As far as I know they are legal to carry when diving because only until they are mounted on the shaft of the spear are they considered a firearm and if you're mounting it, you're in danger.
Look up some more info on them because I could be wrong. You can make them quite easily, and I feel like you could easily modify one to work on a gaff.
I have a .40 Powerhead I've dove with after a Mako encounter last summer.
Additionally, you could carry a powerhead with a blank round and skip all the legal BS. The bang, and pressure alone would keep any moving creature away
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