Valka Castle is a sunken and abandoned castle that can be accessed through the Well of the Full Moon in Ciceros Strait. It contains several different rooms, each possessing various animals and salvage locations.
Built by a ruthless emperor in the late 16th Century, Valka Castle has been a strong empire for many years, until one day, it suddenly sunk into the sea.
After swimming through the Well of the Full Moon in Ciceros Strait, divers will see this tall tower filled with several fish and hammerhead sharks at the top. There are two passages: one going north and one going east.
This is the passage going east in the Spiral Tower. It leads to a dead end, but there are still some interesting coral reef fish here.
As its name suggests, this is where soldiers kept their army during the castle's heyday. Coral reef fish and a Longtooth Grouper are seen here.
This is where treasure was kept. Small fish and meagres are found here. The first time through, it will be locked, but divers will notice a hole large enough for Oceane to squeeze through, and she will open the door.
This is also where the Servant's Ring is found.
A giant, glorious ballroom where people had danced when the castle was above water, it is still the perfect ballroom for fish to swim in. Coral reef fish, schools of fish and even a false killer whale are found here.
Just outside the ballroom, there is a door that was locked on the other side, but can be opened on the side the diver is currently at.
This is where the mighty Prince Valka stayed in. After entering, the doors will close and lock, locking the diver and Oceane in the chamber after The Song of Dragons is played. The only way out is by activating a mechanism under a desk.
A small room connected to the King's Chamber. This is where the first Okeanos Tablet is found.
- Dangerous Luna Lionfish are found here.
- At night, Phantom can be here.
- Thanatos can be seen out the window in Mermaid's Ballroom after the main story is completed. The Anomalocaris can also be seen out a window, but not in Mermaid's ballroom, but in the Underwater Gallery although Thanatos can also be seen here too.