Lemuria's Depths

"No one is entirely sure how, but all ships that are laid to rest on the seabed all end up in the same place. From beyond the watery grave, these seafarers continue to manipulate the waves to meet their gains."

Overview
The Lemuria's Depths is a level 7 Dungeon located East of Castillion, a bit northwest of the current center of the Ocean. The boss of the dungeon is the Red Devil, a monstrous squid that has wrecked ships that cross by.

To gain access to the Dungeon the player has to complete the level 7 dungeon quest Red Devil's Treasure, which is started by talking to Marston, a pirate who've collected a crew to go out looking for Red Devil's treasure, inviting you to join them.

Trivia

 * The dungeon is based off of the 'lost land' named Lemuria off the coast of the Indian Ocean.