These zip-loc bag chambers(the ones meant for diving), should really be thought of as a hyperbaric stretcher. So you put the bent diver in the chamber then transport to the closest chamber facility. They shouldn't be ultilized as stand alone chambers, the ammount of gas (both air to compress and O2 to breath at depth) needed to treat a diver makes it impractical. The gammov bags which is what this thread was orginally about don't compress enough to do much good. Stick with what you learned in your basic OW class. 100% O2 and transport promptly to the nearest chamber. It might be a good idea is get trained in CPR for the professional rescuer so you can learn to use the ambu bag with O2.