Weirdly, I went back and checked those, and they are all in limit. All things being equal, I suppose, and assume, I have something set incorrectly in the ECS. To quote Tom Hanks, "it has to be the oxygen." In reality, I think that if O2 wasn't flowing the crew would die, but the LiHO would be overwhelmed and CO2 would rise, but I don't know how this is implemented. It doesn't seem possible to change cartridges, so I guess the CO2 is a bit of a work-around, but maybe if O2 wasn't flowing correctly, that might cause death. I'll re-fly the mission and pay closer attention to the way the automatic checklist sets everything. The problem is that, although I've read the G&N manuals for several iterations of the CM, I can't seem to find a manual for the bloody plumbing! I'll update this thread if I figure out the stupid thing I must have done. One thing I wish, though--if a situation occurred where the crew was in danger, MCC's flight surgeon would be burning up the wires, but I never got a message. I don't know the inner workings of MCC, but it would be quite nice if it, or the sim in general, would just casually mention that, "uh, 11? You seem to be about to croak..." :lol: