Salt mines also can have lots of problems like the Asse in Germany. As soon as you begin drilling holes into the salt mine it's possible for water to flow in ag

Salt mines also can have lots of problems like the Asse in Germany. As soon as you begin drilling holes into the salt mine it's possible for water to flow in again http://en.wikipedia.org/wiki/Asse_II_mine#Water_inflow http://en.wikipedia.org/wiki/Asse_II_mine#Water_inflow