Shipwrecks conjure up images of lost treasure, sometimes lost lives, or if scuttled, abandoned possibility. All this creates a bittersweet sensation that lures us to them. Wreck divers tend to fall into a couple of categories - those that are just there to observe and those still struck with the "treasure hunter" vision. But for each object removed, these submerged artifacts become less and less of a treasure of information and history. Best to leave them as they lay. In the case of military wrecks, they still belong to the military - no touch!