The bobbit worm (Eunice aphroditois) has probably been created in an alien nightmare. This thing grows up to 3m, but you are lucky if you see it in the open and in full length. Most of the time, it is hiding in black sand, showing only little of its rainbow pattern and waiting for smaller fish to touch their antennas. The “teeth” then snap with great speed – actually one of the fastest movements underwater. I encountered this one while muck diving in Anilao (Philippines), Manado and Lembeh (both Indonesia).