On the first picture you can see a specimen photographed inside a wreck. It can withdraw slowly when disturbed. The second and third photo shows the body of the worm that is usually buried into sand or sediment and not seen by divers underwater. We found it when we cleaned lost fishing-gear from sediment. When you touch it you will get green pigments (bonellin) on your finger. It is a weak poison that can give small animals problems if the come to close to the worm!