Down the Rabbit Hole

Down the Rabbit Hole is the main easter egg for the map Mines of Despair. It requires the player to destroy the mine, as well as defeat McPhillian.

Step 1: Gas Valves
Around the map are four main gas valves that can be turned. The player must go up to them and hold the interaction button until the wheel stops spinning on the valve. When all four are turned, a large hissing noise will be heard.

The location of the valves are in the following:
 * On the "observation deck" within the main excavation site, across from the Der Wunderfizz machine.
 * Within the Bunker, near the Power Switch.
 * Near the main "toll booth" at the Mining Checkpoint.
 * In the mineshaft leading to the Ruins from the main excavation site.

Step 2: Explosives
With the gas now flowing throughout the mines, the player must acquire a total of four pieces of dynamite from the tipped over minecart in the main mineshaft between the Ruins and Bunker. The player can only carry one piece of dynamite at a time.

Each piece of TNT goes to a different part of the map:
 * On the main support beam at the "observation deck".
 * On a cracking wall within the Ruins.
 * Within the power room of the Bunker, under a table containing several documents and computers.
 * Within the tunnel containing the dynamite filled minecart between the Ruins and Bunker.

Step 3: Assembling the Detonator
The detonator to the dynamite can be found within the Bunker. However, it is damaged and needs some replacement parts to fix. Within the mine and the camp up top are a total of three pieces; the power source, a wire and a trigger. All of the pieces have fixed locations around the map.

The area of where each piece of the detonator are: When the player collects all three pieces, they can assemble it at the broken detonator. Upon fixing it, the player can pick it up. When the player picks it up, there will be an audio quote about one of the gas valves turning off.
 * Power Source - Inside one of the building within the surface camp.
 * Wire - Within the supply room of the bunker, on a shelf.
 * Trigger - On a desk at the Mining Checkpoint.

Step 4: Blood Altar
The player must head to the gas valve in the mineshaft connecting the main excavation site with the Ruins. After adjusting it again, a mysterious alter in the center of the Ruins will begin to glow red. The player must now kill thirty zombies near the alter until it is filled. The player will know this is done when an audio quote mentioning the leader of the Coil Arms Division, Tom McPhillian, is mentioned by one of the characters. Interacting with the alter after this will cause the entire mine to shake, followed by a strange explosion within the bottom of the mine.

Step 5: Final Battle
NOTE: It is recommended the player has Pack-a-Punched their weapons and gotten all of their necessary perks before beginning the boss fight.

The player must head to the Mining Checkpoint and locate the security monitors in the main toll booth. Interacting with them will reveal that McPhillian himself is within "The Deep End", much to Brian's chargin. The players must now go into "The Deep End", where McPhillian is waiting. A brief cutscene will play, with McPhillian at first expressing his confusion on how he ended up in the mines. Upon realizing who he was being confronted by, McPhillian, in a moment of panic, accidentally comes into contact with some of the Element X samples in the mine, causing him to slightly mutate and power up before charging at the survivors.

The player must now fight against McPhillian. McPhillian will have three attacks, one being to summon a small swarm of zombies, another being a massive ground pound which the players will have to jump to avoid and a fireball attack, to which he will shoot two fireballs randomly. The player must shoot at McPhillian, who has a lot of health. After he takes a certain amount of damage, an "intermission round" will begin, to which the players will have to fend off against a wave of zombies before repeating the battle. Each round causes McPhillian to do his attacks more and more rapidly. After the third round, the entire screen will go white and the end cutscene will play.