Chain Moray. Apparently common in the Caribbean although this was the only one I have ever seen. It looks almost like a dinosaur.
You often find moray opening and closing their mouth. Although intimidating like they might want to attack, this is actually to help the flow of water over their gills.
Once an eel stops doing this and stares at me closed mouth, that’s when I decide its time to go take a photo of a worm.