I worked at a place that put a cube farm in a 'cleaned' out oil bunker for the former power plant. They built false walls and had airflow between the concrete

I worked at a place that put a cube farm in a 'cleaned' out oil bunker for the former power plant. They built false walls and had airflow between the concrete wall and the false wall[1] which was a rather scary wind noise since we were 50' underground. Obviously no natural light and cell phones and radios didn't work. Had to wear a tie / jacket because dress codes even though it would have been illegal for a client to get into our area. I call that job my "3 Seasons in Heck". 1) something to do with concrete still bleeding oil even if sealed so smell wouldn't get to us.