This achievement is awarded to the player for blowing up the airlock and the side entrance in the Cursed station. The player must do this by collecting the demolition charges from the dead demolition team in the right tunnel (if the player faces the shrine) and planting the explosives in the opposite tunnel. The airlock requires a grenade to close and is placed on a pillar supporting the airlock door, thus destroying both tunnels the nosalises are coming from.