It doesn't, the autoloader is right in the crew compartment (which is the whole problem with munition cook offs killing the crew and ejecting the turret). The t

It doesn't, the autoloader is right in the crew compartment (which is the whole problem with munition cook offs killing the crew and ejecting the turret). The thing that keeps NBC out while the breech is open for loading is positive air pressure inside the tank. This argument only makes sense if the turret is entirely unmanned.