I’d read about Havre’s underground city, Havre Beneath the Streets, and had called to make a reservation for a 9:30 am tour. 

A fire in 1904 totally leveled several blocks of the city’s commercial center. The business owners improvised. All the shops had substantial basements which had not been damaged. Tunnels were dug and holes were knocked through walls to form a maze of connected shops and businesses, a warren of underground commercial activity,

We were heading underground to explore the remains of that subterranean city.