The vault is built into an excavation of metasediments in some folds south of the Tien Shan. These are the extreme eastern end of the spur of folds that forms the southern edge of the FT belt. The vault is a small building with two rooms and thick walls. The smaller room provides an entryway, while all the equipment is in the larger room. The STS2 is on a pier next to the Aksu sensors and DAS, disk, and Kepco share a table with the telemetry equipment.
Batteries are beneath the table.
GPS antenna is on the roof, cemented in a wooden box with the cable fed into the room via a hole in the post supporting the telemetry antenna. Lock may be intermittent because of abutment of vault against shear face of excavation, which blocks out half of the horizon. Pictures from the 1999 installation. When Wha is the director of the site. His assistant is Wong Je Quan.