There needs to be a plug in in the Hanger for Oxygen so that you can plug in the heavy rover to replenish oxygen. If anyone wants to use the oxygen in the heavy rover, they have to refill it every few days. Currently, the only way I know of to fill it is to run a hose from an oxygen tank to the heavy rover oxygen in port. This can't be done when the Rover is in the Hanger with the door closed. The hanger is sort of flawed without this, and won't be a good place to keep the heavy rover if you always have to drive it out to plug it in in order to replenish the oxygen. I think that most people just feel disappointed in the oxygen interior of the heavy rover, and just don't use it, because of what a pain it is to refill. It's a shame. Maybe an upgrade for late in a tech tree to give the rover itself an oxygen scrubber? I'd settle for a way to replenish oxygen while in the hanger, though
0.0417385