I guess you have never dived in an NZ cave?
There are some big (BIG) eels in there and if they are in a crappy mood they will have a nibble (and I really mean NIBBLE).
I was actually stalked by a large eel when out fishing (I was about 18 then). The sod get between me and the bank (I was out on a wee finger of gravel). He (it) lifted his head out on to the wee path I had used just so he could size me up (but I saw him). He slid back down and I'm like thinking 'where the hell has that sod gone too'?
I'm looking down into the water at my feet and there he is...coming straight up at me.
I already had a gaff in my hand with the head down in the water, and reflex (panic) action I lifted the gaff straight up and into his head.
Next thing I'm dragged down to my knees with my arm in the water fighting this bloody thing. He was big and powerful.
Long story short...I finally dragged him up and back to the main bank. Stabbed and stomped the sod.
Took him home and we strung him up on a tree. Measured 26" around the head (I did say he was BIG). He was longer than me, so more than 6' long.
Skinned and cleaned him, cut him through across the body into nice thick round 'steaks'.
He was absolutely delicious!
So yeah, there are jaws in NZ caves.