You have to look at the subset of the probability space where anyone is alive and base the rescue attempt off that. There's no reason to do a body recovery in t

You have to look at the subset of the probability space where anyone is alive and base the rescue attempt off that. There's no reason to do a body recovery in this case, it's not like when a dead SCUBA instructor is blocking up a underwater cave and you want to use the cave again, or if it's easy to get the dead body out. It's not, it's really hard and dangerous. In the Thai cave, it was thought that the probability that at least one or two of the children were still alive was high enough to risk a couple of old divers having a look. In my opinion the Thai SEALs (as well as dumb ideas like sending people in to string up lights and pump water) should not have taken the risks they did, the more people you put in the cave the more likely something will go wrong for one of them. So, after ruling out body recovery, the only plans you have to make include the submersible being intact, hence needing to know how much air was left.