Previewing: Action Squad: Twin Cities Urban Adventurers 
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The regularly-updated online home of an American explorer crew active since 1996. Site features trip logs, maps, historical info, & hundreds of photos. Missions include drains, mines, sewers, natural caves, brewery caves, steam tunnels, tailraces, industrial ruins, ghost towns, bridge rooms, abandoned sanitariums, city utility tunnels, and much more.
Action Squad: Twin Cities Urban Adventurers owned by: actionsquad
A member of Urban Exploration since 08/02/2009.