'Tunnel Rats' Logo For Those Working In The U-M Steam Tunnels, July 28, 1993 Published In Ann Arbor News, August 8, 1993 Year 1993 Month July Day 28 Rights Held By Donated by the Ann Arbor News. © The Ann Arbor News. Copyright Copyright Protected Related Tunnel Rats Photo Subjects University of Michigan Tunnel Rats University of Michigan - Faculty & Staff Tunnels Utilities Welding Old News Ann Arbor News Michael A. Curlett