Old Entrance Shaft A small upper level was accessible via ladder through the hole in this ceiling. Ben for scale. Similar Images ...based on the tags: barrels, black&white, caves, people, ropes, tcdrainer... Rivets are sexy, and this old machine has more than a fair share. The engine room. A cottage for masons infected with TB to live together. A machine to cast copper billets. From the catwalks below the hoisting motor in Shaft No. 1. New friends met at the exploring expo. The approach to Dock 4 is long demolished, so it is only accessible when the lake freezes. The Atlas D command building. As Brutalist as it gets. Look at the floor–do you see the hole? That goes down a lonnnnnng ways.