patrick witman, ryan dart and philip leiman are ex-ploeshers and about to go into this cave. >> we justassed the entrance and i'm going to proceed further into the cave. >> i'm with this. no giant ocean full of things trying to murder know. >> just creepy crawlers here and there. >> we found where they make roaches, the roach factory. >> oh, no, holy cow! >> the whole place is like crawling! >> one of those things get in your wet suit forget it. >> they gear up and, boy, oh, boy, is this absolutely stunning. >> they have to sort of put their tanks on the side so they can fit through. >> they're also trying to stay down there for about two hours, so they have to make sure that they have enough oxygen. >> you don't want to bump into any of those features, you don't want to break the stalactites and cause damage so that's another layer of this expedition. >> they are very respectful of where they are. >> are those guidelines? >> yeah, that's their way in and out. >> often times if you're not paying attention, you can get lost and if you run out of oxygen -- >> you dead. >> you stop. >> the