Secret passage
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Secret passages, also commonly referred to as hidden passages or secret tunnels, are hidden routes used for stealthy travel, escape, or movement of people and goods. They are sometimes inside buildings leading to secret rooms.
View inside the Passetto, the secret passage between Vatican City and Castel Sant'Angelo in Rome, Italy
A secret passage in Bran Castle, a 14th-century fortress in Romania.
A trapdoor on the jungle floor leads down into the Củ Chi tunnels. Closed and camouflaged, it is virtually undetectable.
The camouflaged trap door, now open.
Smuggling tunnel
Videos
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.
A drug smuggling tunnel in Arizona
Sarajevo Tunnel
Route of a Sinaloa Cartel drug tunnel under the US/Mexico border
Smuggling tunnel in Rafah, Gaza Strip (2009)