The Deep

In a map created by Derek Waterdeep, the ocean was divided into four parts, The Surface Sector, The Middle Sector, The Deep and the little-known Darkness Realm, home of the Lungin Worm and the Brute Wromow Shark. The Deep, as it's name suggests, is the 2nd deepest sector. It houses carnivorous creatures with bioluminescent body parts and reinforced submarines are necessary to acces it.