Very easy to tame. All you need is a friend, a turtle with high health and a couple good scuba gears. A mount to regain your stamina. You get your friend on the tutle to get it's attention, you wipe out anything else. Once clear, watch it's shock and wait. Between electric shocks, swim in to feed while it does barely 1-2 damage to your friends turtle. May take a little time.

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