some sort of a worm?

Hey all

Found this one in a night dive in Gordon beach, Tel-Aviv, Israel at about 4-7m depth.

When I got really close to it, it retracted inside the rock.

sure looks like the tail of a fish?  Many fish nestle in the rocks to sleep.

Agree with rwb500, it may be a fish tail or something similar, as it does not look like any worm or such.

Yeah I was wayyyyy off here hahahaha

It's a fish tale, Thalassoma pavo tale