The Tunnel of Isis

The Tunnel of Isis is a major transprtation tunnel used by demigods all over the world. It is used as a major setting in the A Hero Was Born series

Transportation
The Tunnel of Isis is said to transport you anywhere you want, from Camp Half-Blood to Indoniesia. For over-night guest, the tunnel keeps a certain section called "Bunkers," where demigods can rest until they're ready to move. The tunnel is also a hospital. As shown in A Hero Was Born, hospital has compartments where doctors treat demigods with wounds. The tunnel is the best transportation around, that it's even used by the gods!

After the Battle of the Tunnel of Isis
After one of the biggest battles of the 1st Major Olympian Civil War, the Tunnel of Isis underwent dire security measures. Instead of the original two drachamas, and demigod must now pay 25 drachamas to enter a certain place. More security guards where posted in the corridors, alert to protect the tunnel from anymore attacks. Business has gone down ever since these measures were put in place.