Strange Isolated Room

[z118]

I can't say I've ever seen this before.... a very odd shaped room with no doors or hallways to get to it. I tunneled into it and there were some creeping gold coins but that's it. When I activated the Phail it lit up the entire area excluding the right most irregular area.

I've seen destroyed areas with no acces before but I can't say I've seen a "room" like this.

Weird?

I apologize if I should have posted the screenshot in a different place or manner.