I ran out of air at about 110 feet inside a wreck* when I was not well trained nor experienced years ago. Dumb ideas are not just for hookah divers
One advantage I did have is that when I headed out of the wreck and up to the surface I got more air around 20 feet and could hang around for awhile. You CAN make 100 feet without any air - my father used to do it testing escape trunks for the Navy - but you sure can't stop for any deco. Anyway, this is just me - NFW would be I be down that deep on a hose without a bailout bottle. YMMV.