Why I always have a backup mask for every dive..... Day 5 of my PDIC class we were running line inside a clean wreck in about 60ft of water......... I approved the tie off and my team (two of us) headed into a tight section in the bow till it opened up for the next tie off. After approval we moved along inside to the next tie off but then my mask was taken. While on line I reached in my pocket for my back up and then it was taken. Ok, guess he wants me blind. I followed the line till I bumped into my buddy and he handed me his back up mask. He is half my size and i could not get the mask to clear no mater what i did. The mask had a little spot in the corner i could see out of ( not funny at the time). After a few more kicks on the way out my buddy had his mask taken and we switched positions then I started to lead us out with touch contact. When we made it to the upline and started to clean up ( got our masks back) we noticed we were missing two deco bottles, back up lights, OPV valves, and our pride.