Underwater Tunnel

Dungeon that stretched across the underside of the Euxine Sea.

Started in the Lost Elven City, and ended in the Crimean Peninsula.

Mostly consisted of a magical space where the sea is held back. Walls are seawater and permeable so that giant fish can pass through in swim-by attacks, sometimes knocking people into the sea. Very cold. There's a break in the middle of the tunnel, but it's a swimmable distance to where it picks up again. The break may be closeable by means of a device in the Lost Elven City that consists of two cones that don't quite touch. The cones are mounted horizontally on a table and there is a part where a handle may've been broken off.

Gunther was lost here.