Moray Eels
From Tomb Raider Wiki
A moray eel from Tomb Raider II.
Moray eels appear in the submarine caverns that link different areas of the wreckage of the Maria Doria. They hide in crevices and appear suddenly when Lara is in range, snapping at her with their jaws. The are more of a hazard than an actual enemy, and cannot be killed. As they are stationary, they do not present much of a problem; swimming past them is enough to evade them.