Limestone tunnels are extensive and "paid for" when mined, now they still exist and are assets that can be rented for storage.
Large blocks were cut and pulled for processing, typically there are access tunnels that are wider than a two line highway with clearance for moving van height trucks with many "bays* that are large mined voids larger than a basketball court or three.
It's cheap storage given the security (controlled access) and the shade from sunlight and protection from rain, weather (hail), etc.
Large blocks were cut and pulled for processing, typically there are access tunnels that are wider than a two line highway with clearance for moving van height trucks with many "bays* that are large mined voids larger than a basketball court or three.
It's cheap storage given the security (controlled access) and the shade from sunlight and protection from rain, weather (hail), etc.