A Secret Passage?
When he used the drill on one of the holes, he discovered that the circular area was in fact a wooden plug. He was easily able to pop the plug right of of its spot on the wall. In the video, cyrex686 points out that the circular hole wasn’t exactly what he thought it would be.
“I thought it was just like two big pipes here, but it’s not. It actually turns out that entirely behind this wall here is another like secret passage or something,” he explained. “Which I think I can enter through this hole I’ve started up here.”