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Finally, there are four annexes that are placed at the extreme northern end of the base. These are the Power Annex, which maintains three fusion reactors (primary, secondary, and emergency), four bays with emergency e-batts, the Emergency Power Grid Control, the Base power plant (underground hydro-electric), Main Power Grid Control, and the Main Power Grid. The Water Annex contains a 1.7 million gallon tank of fresh water; four water wells. The Sewage Annex which filters, and recycles “gray” water and dries out and burns “black” water. Finally, there is the Air Annex which filters and recycles the base’s atmosphere and as well as filters and purifies outside air and then runs both through the base’s HVAC systems.

At the far end of the annex/GSSPs system are a security complex and another blast door, leading to the Annex Tunnel. The tunnel runs just short of three kilometers to the north of the Base. The tunnel is six meters wide and four meters high and it doesn’t run in a straight line. Starting three hundred meters from the blast door, it turns gradually northwest (in all a 10-degree turn) and after running five hundred meters, there is a blast door and a turn north (another 10-degree turn) and it then runs a kilometer north before another blast door and a 20-degree turn the northeast. The last one point five meters is straight and ends in another blast door. At the near end of the tunnel, its depth is eighty meters but gradually rises to a depth of three meters below the surface.