Steam Tunneling

Steam tunneling, the popular tradition of descending into and running through Stanford's intricate network of underground steam tunnels, is particularly popular during cold winter nights. As the steam is very hot, be sure to wear clothes that will help protect you from burns. Take a flashlight with you, and read up on what you're doing before you go. Keep track of how you got down there so that you can get out without being stuck down there all night.

Further Reading

Daily article on steam tunneling
Extra information on steam tunneling