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  Chute Tunnel/Cave & Pillsbury Canal
  A long-buried natural cave and the man-
  made tunnel that once connected it to
  the outside world.

  Cobb's Caves
  A long-lost cave system beneath downtown
  Saint Paul, which we were only able to
  discover with rappelling gear.

  East Bank Tailrace Tunnels
  Tailrace tunnels from the late 1800's,
  and associated abandoned building sub-
  levels.   

  Ford Motors Mines
  The extensive tunnel network beneath
  the Ford Motors Plant, used in the 30's
  to mine sand to make into auto glass.

  Fort Snelling Drains
  Old stone drainage tunnels beneath the
  historic Fort, home to a variety of
  loathsome creatures.

  Heinrich Brewery Caves
  A small system of caves once used to
  lager beer for the Heinrich Brewery a
  century or so ago.

  Kittsondale Helix Drains
  Two major drain systems on either side
  of Saint Paul, each featuring unusual
  stone spiral staircases.

  Labyrinth, The
  The Holy Grail of Twin Cities Urban
  Adventuring - seven interconnected
  tunnel systems tangling beneath St Paul.

  Lucky 13 Drain
  A massive Saint Paul drain featuring
  an impressive impact cup dropshaft
  complex.

  Nicollet Island Tunnels (Satan's Cave)
  The infamous "Satan's Cave" and related
  utility tunnels from long ago.

  Phalen Creek Tunnel
  A truly enormous drain, built in the
  1800's to entomb a creek that got in the
  way of the railroad companies.

  Redwing Caves
  A variety of manmade and natural caves
  in the bluffs of scenic and historic
  Redwing, Minnesota.

  Stahlmann's Brewery Cellars
  Extensive and deadly, this network of
  brewery caves, tunnels, and sewers
  almost killed us.

  Temple of the Drowned Cat Drain
  A nifty drain with some interesting
  architecture.

  U of MN Steam Tunnels: East Bank System
  Action Squad's birthplace. A two-level,
  extremely extensive steam tunnel maze
  beneath the entire campus.

  U of MN Steam Tunnels: West Bank System
  The corresponding, much smaller system
  across the Mississippi River.

  U of MN Steam Tunnels: Saint Paul System
  The U's steam tunnel system beneath the
  Saint Paul campus. We almost got busted
  there twice.

  Wabasha Street Bridge Tunnels
  A bizarre network of tunnels, bridge
  rooms, caves, plus the innards of the
  Wabasha Street bridge itself.

  West Bank Tailrace Tunnels
  A mostly flooded system that carried
  water back to the river in the 1800's,
  after its energy had been harnessed
  and converted into electricity.

  Yoerg Brewery Caves
  A four-level (kind of) brewery cave
  system, well over 100 years old.