Duct tape, zip ties, assorted o-rings, 3 different sizes of crescent wrenches, allen wrench set (SAE and Metric), spare bulbs and batteries for flashlights, screw drivers, couple of knives, multi-tool, portable hyperbaric chamber, probably a bunch of other crap I forgot that's in there, and best of all, a cooler with a few cold ones in case there is no chance of saving the dive