File:Quake1.gif End Tunnel Health Will gib when health is Attack Damage Drops [Source] End Tunnels are tunnels designed with the specific purpose to exit a level. Though not mandatory, they often have a light source placed at the beginning of a tunnel that is relatively lengthy. The length causes the tunnel to appear to fade into darkness, which disguises the fact that a back wall exists. They are used to exit most of the levels in Aftershock for Quake.