You and Anton find yourselves in a small metal box with diving gear to the side; donning the old brass diving equipment with assistance from each. You both opened the door ahead and let the cool blue flow in.

The Deep Blue is vast area of corals reefs and aquatic life. A section dips deep into the twilight zone which barely any light escapes.

For those new, here is the start of the Dungeon of Change series: Darkwood

Generally recommended to start there to understand the lore a bit more and the character Anton Goebel.