As one walked into the tunnel, there is an enlarged chamber allowing for two-way human traffic. This was important since the walkways in the tunnel tend to be very narrow. The tunnel then splits into two. One leads to the cartridge storeroom and hoist area while the other leads to the shell storeroom and hoist area. A hoist is a mechanical pulley system to lift the shells and cartridges from the underground room to the emplacement above it. The allocation of separation hoists for the shells and the cartridges allows for convenience and a more systematic operation of the gun above it.