South Pole Traverse 1 (SPot1) is on it’s way back from South Pole Station to McMurdo. Traverse 2 (SPoT2) is about 400 miles out from Pole and it seems the tracks on the Caterpillar Challenger tractors are delaminating.

A bit of a concern and replacement tracks will need to be flown out to be replaced in the field.

Caterpillar Challenger Tractor Unit

Caterpillar Challenger Tractor Unit