It was a large tracked vehicle with 3 long segments, but not sleek as the excavators. It was manned by a crew of 4. The metal snout had a transparent front debris shield. The middle segment could be connected with pipelines to other vehicles, such as excavators, to transfer supplies (mechanical parts, equipment, drill bits, fuel, cooling fluid).
It also brought supplies to crews in mesh baskets, as well as parcels and letters.