Radford University Sites on the Tunnels
RU Magazine article about 1972. Talks about the first male class at RU and some of their pranks, one of which being traveling through the tunnels.
RU Magazine article about Heth Rock. Mentions exploration of the tunnels.
Facilities Management Services - Building Trades. Shows a picture of tunnels currently under construction.
Various sites mentioning maintenance and procedures: 1 2 3 4 5 6.
Virginia Tech Steam Tunnels.
Urban Exploration WebRing.