We found this tunnel entrance outside of the patient's building.
It was covered by a huge iron grate that we lifted. It weighed a ton.
There is an iron ladder leading down to the darkness.
kind of creepy since i read that excert from that link by prairieghosts or something, where the story of alvin and agnes were told. *sigh, it's sad how none of this is preserved and lookeed into by the government.