Camp Halfblood and the tale of Thomas
Mobile aquatic headquarters of Kronos' Army.
The Princess Andromeda was a luxury cruise ship captained by Luke Castellan, and was the primary living space for Kronos’ Army. It was recently destroyed with Greek fire by Percy Jackson and Charles Beckendorf (head of the Hephaestus Cabin), though their attack resulted in Beckendorf’s death.
Before it was destroyed, the Princess Andromeda could travel faster then any mortal ship, and was the resting-place of Kronos’ sarcophagus. It served as a mobile base-of-operations for all sorts of monsters, including Dracaenae and Drakons.