Sarajevo Tunnel

The Sarajevo Tunnel was constructed between May 1992 and November 1995, during the Siege of Sarajevo in the midst of the Bosnian War. It was built by the Bosnian Army in order to link the city of Sarajevo, which was entirely cut off by Serbian forces, with Bosnian-held territory on the other side of the Sarajevo Airport, an area controlled by the United Nations. The tunnel linked the Sarajevo neighbourhoods of Dobrinja and Butmir, allowing food, war supplies, and humanitarian aid to come into the city, and people to get out. The tunnel became a major way of bypassing the international arms embargo and providing the city defenders with weaponry.

• http://en.wikipedia.org/wiki/Sarajevo Tunnel