The reason for going to Fossil Bluff was to provide Fire Cover and Search and Rescue for the Twin otters, to refuel them, to unload and make the fuel depots and to shut the base down as it is now a summer base only.

Refuelling a Twin Otter

A fuel depot, after winter these drums have to be dug out as the snow covers them and then it turns to ice as the temperature drops to -50.
It 's so hard to dig them out of solid ice.