Riding the Windmill Elevator back up from the Mining Cavern closes the reservoir and its tunnels for the rest of this run. Before you go, have: the goats at the South Windmill, the Central Walkway and the Submerged Bank; the Gatehouse Back Yard outhouse (the 10th, for When You Gotta Go...); the files Changing the Cranks, The Reservoir and Giant Fish, Moreau's Diary 1 and Moreau's Diary 2; the M1911 – High-Capacity Mag.; and the optional treasures: the Crystal Fragments in the Mining Cavern and the Gatehouse shack, the Perfect Crystal Skull from the Underground Cavern, the Silver Angel Statue and, if the cave still opens, the Water Cavern's Large Crystal. The windmill yard at the top stays open.