- Leo shows his cabin mates that he can use fire, and they are appropriately impressed.
- He also shows them the secret Bunker Nine. They are even more impressed than before.
- They find Festus's head, which Hephaestus brought here so Leo could reuse it.
- There are lots of blueprints for weapons and such, too.
- Chiron explains that the bunker was built during the Civil War, when demigods fought one another (conveniently at the same time as the American Civil War).
- One side in the war was Camp Half-Blood, and the other side was the Roman camp.
- They look at the blueprint of a ship on the wall and realize it's just like Leo's crayon drawing when he was a kid. Also, Festus is the prow of the ship.
- Leo says he'll build the ship and call it Argus II. Then they'll fly it to Greece.