The Tunnels are a series of corridors underneath New York City seen within Pandemonium. Lena Haloway and Julian Fineman travel through them at one point to escape from Scavengers. The tunnels are also the home of an underground group of Invalids comprised mainly of disfigured or disabled people who would've been rejected if they had stayed within the verified communities.

The tunnels are implied to be the subway system within New York that has now been shut down and sealed off.

PortlandNew YorkThe WildsVerified CommunitiesUnited States of America
New York
The CrapsSalvageThe TunnelsBorder