From PathfinderWiki

Beneath the main part of the dwarven metropolis of Highhelm, tunnels weave through earth and stone connecting thousands of halls and chambers. These lower levels are known as the Depths and attract goblins, orcs, and other enemies. Groups of skyseekers are sent into the Depths to map unknown sections, recover artifacts, and keep the area secure. The massive structures of the Depths were built within the Emperor's Peak mountain as the dwarves burrowed their way to the surface during their Quest for Sky. Thousands of years of dwarven culture and history are buried in the Depths.[1]

Notable locations

Deepscar is an abandoned keep hundreds of feet below the Inner City of Highhelm. The dwarves blocked and barricaded the road to Deepscar thousands of years ago when they vacated the keep and continued their destined Quest for Sky.[2]