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See that the keel of the ship has gone below the surface of the water and that means to me air is leaking out of it. they need to maintain those salvage pumps, pumping air into the ship, to try to keep an air bubble, as much as they can. but like tom said, those divers have a terrible time trying to get inside that ship. because, again, those divers are using a surface supplied system so they have air hoses attached to their helmets. when they go through that rabbits warn of spaces, they're dragging their air hoses behind them that are connected to the surface, to the dive ship. and they're dr...

It is a gigantic challenge and hour by hour the chances of anyone staying alive in these conditions is of course diminished. >> tom foreman, appreciate that. with me again now, captain jim staples, 20 years with the merchant marines. also, retired u.s. naevy captai and experienced diver bobby scholely. it's 1:00 in the morning where the ferry sank. time is so precious. every minute can mean life or death. is there anything these water search crews can do overnight in that water? >> well, i think one of the things we talked about if they can try to keep that air bubble maintained in that ship. ...

Diver showed us how air pockets can be found. >> when they're in a small compartment with an air bubble, they have to stay calm and breathe shallow and conserve the oxygen in that space. >> reporter: aside from the danger and difficulty of passengers trying to get to air pockets and close water-tight doors, bobby sculley says there's a danger of trying to pump air into an underwater vessel. >> you risk letting the air out of that compartment and allowing the ship to start to sink even more and that risks those survivors that might be in that situation. >> reporter: but sculley says south korea...

Us where air pockets can be found. >> when they're in a small compartment like this with an air bubble, they have to stay calm and breathe shallow and conserve the oxygen in that space. >> reporter: aside from the danger and difficulty, she says there's also a danger in trying to pump air into the overturned vessel. >> if you drill a hole in that ship in a compartment that has air in it, you risk letting the air out and allowing the ship to start to sink even more. that risks those survivors that might be in that space. >> reporter: but she says south korean rescue teams are very capable with ...

Could take steps to help themselves, though they probably don't know it. >> they need to find a watertight door such as this one, that they would close and seal it. >> reporter: former navy diver bobbi seeley showed us where air pockets can be found and how potential survivors could use them. >> when they're in a small compartment like this with an air bubble, they really have to stay calm and breathe shallow and conserve the oxygen in that space. >> reporter: there was an effort to pump oxygen into the korea vessel with the hope that it could create air pockets. but that attempt failed becaus...