Dungeon Magazine #144 produced an adventure called "The Lightless Depths" which was a continuation of the Savage Tide adventure path. In the story, this place is located in the Underdark below the Isle of Dread and populated by "mongrelfolk" (a hybrid humanoid race of underground dwellers). Using Rob Lazzaretti's art as inspiration, I added to the design and created this to give our campaign a more realistic feel when they arrive.
High Resolution, clean, DM, gridded, and other versions of this map can be found on the Supporter Post here: https://www.patreon.com/posts/savage-supporter-94231051
Foundry Virtual Table Top scenes and other files can be found on the Adventurer post here: https://www.patreon.com/posts/savage-96552186