protect the divers and give them maximum stay times to get inside that ship and work their way from the bottom up through those dangerous compartments to get inside and look for any survivors. but they have to be very careful because they do not want to jeopardize either themselves, of course, but they don't want to jeopardize any survivors by trying to rescue them at this point. and then they have all the environmental conditions you saw. >> environmental conditions, because there's probably some -- a lot of debris in the water. but stop right there. you said they don't want to make things worse. so my question to you is, if they do find people alive in air pockets, they've got to very carefully try to get them out because they've been in there for a couple of days. how do they do it? >> well, if they have survivors in there in air pockets, remember that ship has gone beneath the surface now.