Smuggling tunnels are secret passages used for the smuggling of goods and people. The term is also used where the tunnels are built in response to a siege.
The Sarajevo Tunnel operated during the Siege of Sarajevo as a passage underneath the no-man's land of the city's (closed) airport, providing a vital smuggling link for the beleaguered city residents. Guns were smuggled into the city and people were smuggled out. After the war, the Sarajevo Tunnel Museum was built onto the historic private house whose cellar served as the entrance to Sarajevo Tunnel
It features in the British film Welcome to Sarajevo. A similar tunnel in an unknown city, probably Belgrade, features in a dark Serbian satire of conflict, Underground.
The Gaza Strip smuggling tunnels connect Egypt and the Gaza Strip, bypassing the Egypt-Gaza Strip barrier built by Israel along the international border established by the Israel-Egypt Peace Treaty. The tunnels pass under the Philadelphi corridor, an area specified in the Oslo accords as being under Israeli military control, in order to secure the border with Egypt.
In 1801, Elias Hasket Derby, Jr. extended the tunnel system in Salem, Massachusetts, in response to Thomas Jefferson's new custom duties. Jefferson had ordered the local militias to help collect these duties, but in Salem, Derby had hired the local militia (later the United States's first National Guard unit), the 101st Engineer Battalion, to dig the tunnels and hide the spoils in five ponds in the local common.