Tunnel

Overview

The Tunnel is a passage in the Salt Mines, a partially inaccessible Sector in the European Dead Zone connected to Trostland. It is reached by dropping down from the Inner Yard, where a scannable object lies partway down.

Progression

Progress deeper into the Salt Mines is blocked by an energy barrier unless the Combustion story mission is active. While Combustion is active, the barrier and the sinkhole open, Servitors and Fallen appear in the Main Quarry, and a Transmat lets you reach a grassy area atop the Salt Mines. The sinkhole, which leads further down into the mines, can only be entered during Combustion.