i am afraid of the bite of those things, little, big it doesn't matter. when they bite, the wound gets infected and ive heard they don't let go very easily. so you don't stick your hands in holes. even so, you run into them on reefs...
i was being followed by a large green moray that came out of a hatch on a wreck as i swam over it with a ring of speared fish, ringed thru the eyes and still alive and kicking a bit. i didn't know the moray was following me, tho my buddy was trying to get my attention. i felt a salamander between my legs as i lazily kicked over the wreck. i looked down and back and saw a big, big green moray between my legs. my buddy said when i looked down, my spear gun went off... because i clenched in shock at seeing a green football with teeth 6 inches from my private parts. i dropped my fish from my belt and he followed it down and crunched off what he wanted. no big deal it turns out, the moray was used to being fed. but i didn't know that.
its funny that we are just now discovering this second set of teeth structures in these eels... inspiration for young people who might think it has ALL been discovered already...