Deep Palace
The Deep Palace of the Sea is an underwater palace for the SeaWings. It was constructed around the royal hatchery

and is supposedly much more magnificent than the Summer Palace. Not as much is known about it compared to the Summer Palace.
This palace is underwater, so only SeaWings like Tsunami can enter it, since they can breathe underwater. It is said to be a canyon in the ocean floor made out of coral, with coral and seaweed growing at the bottom like beautiful gardens. Groups of SeaWings are clustered around talking in Aquatic. It seems to have a relaxed and safe atmosphere, since no enemies can ever reach it. Queen Coral mostly resides here, unless business is to be made at the Summer Palace of the Sea or Blister is visiting. This is where the Royal Hatchery is, along with the enchanted statue of Orca (until is was destroyed by Tsunami). The Royal Hatchery contained heat tubes. The main shelter seems to be passageways and rooms inside of the cliff walls. It is on the back cover of The Lost Heir. It also contains buildings were some special SeaWings live in.