The pump house is my personal favorite, it’s always less crowded, and much less hoky than most of the other attractions. Basically, if you sink to the bottom of the tower on that side follow the rope past the platform at 60’ then follow the pipes to, and through, the most interesting part of the quarry. You’ll find the remains of the scaffolding the workers took into and out of the quarry, as well as all the structures related to getting the water they pumped out. Safe diving.