Minneapolis Drain
Archive
These guys rock, they've been around forever and still explore.
The site could stand some updates though.
Urban Speleology
The site of cave explorer Greg Brick. Some interesting local info
on urban caverns and tunnels.
Action Squad
Probably the most well known local exploration group. They could
also use some updates, lazy punks.
Hollow Hills
A local E-zine and forum with a lot of activity and some interesting
projects.
UER.ca
A worldwide forum with some local info, and a one-stop source for
14 year olds to talk about UEing their basement in ninja suits.