I've just viewed some YouTube video of C130s operating from the Antarctic bases. One showed pax boarding whilst the a/c sat with engines running, spewing vast amounts of condensation/contrail which blew around. Given that we should be preserving these lands, just how much Jet A1 could there be in that exhaust and would it settle out on the surface ?
If they turned the engines off they my not be able to get them started again. I have a friend that was a Navy medic, they took an ambulance to Antartica. The ambulance did not have its engine turned off from the time it was unloaded from the C-141 until it was reloaded six months later. Is cold down there and thing have a tendency too freeze solid quickly.