"Bright Mountain Tunnel" is a Quarantine Zone available in Dying Light.. It is a large underground rail tunnel which contains two crashed trains. One end of the tunnel is inaccessible due to a relatively large chemical spillage which has created a large deadly cloud of gas, which will rapidly kill you if you enter it. Also, a large amount of viral zombies are present, so extreme caution is recommended when in this quarantine zone. The zone itself contains 5 DROP packages and a number of GRE crates.