What are the risks involved with wreck diving?

Wreck diving gets more risky with deep penetration dives.  Wrecks often have fishing line or nets in which divers can get caught and the wrecks may also be unstable, which could result in part of the wreck breaking and coming down on a diver.  In addition to this, some wrecks require very deep diving and little to no light and there can be tight spaces and twists and turns.  Ultimately, deep penetration wreck diving should be treated a lot like cave diving.  This means that a guideline should be run, a knife or other cutting tool should be carried, and the 'rule of thirds' should be applied to gas usage: 1/3 going in, 1/3 going out, 1/3 for emergencies. Lastly, always remember to utilize redundant gear.