Don t bother them, and they probably won t bother you. Sharks, however, are considerably less predictable than barracuda, especially if large. Don t take a chance. If there are big sharks around a wreck, find another place to dive. Normally, divers shouldn t enter a wreck.
Most divers can see all they want by cruising around the outside of it.
Entering a wreck has special dangers, and should be attempted only by experienced divers. For one, there is no up inside a wreck. If problems arise and a diver needs to get to the surface, he must first get out of the wreck. This problem also exists with cave and ice diving, both of which are dangerous. Another danger is getting trapped.