Once we found the entrance we bought rope and flashlights.

The lock had been broken by previous explorers

We didn't need the flash lights, the 7 foot tall tunnels already had lights.

Steam pipes stick out of the wall and the tunnel seems to go on for ever

Graffiti reveals that we are not the first explorers. This group calls them selves the lab rats, luckily we didn't see any real rats

Even with spewing steam the tunnels weren't that hot, thanks to a system of ventilation fans.
If you find the entrance explore at your own risk.