Bombers are Zombies that have huge green bombs strapped to their backs. These Zombies typically spawn starting at Round 11+, but you can get to them earlier than Round 11. What you need to do is turn on the power and open the bunker door. Then, you must re-route the power inside the bunker to open another door that leads to the Salt Mine Tunnels. (videos are linked below on how to do turn the power on and re-route the power). Once you get inside, you will see four bombers. Allow them to follow you outside of that area. Get them into a wide open area and shoot them in the head so their green bomb falls off of them. It's very important to not allow them to get too close to you. If you do, then their bomb will automatically explode on you.

Now that you have one of the bombs on the ground, it's time to lure zombies to it. During a wave, you will need to "Train" zombies behind you and get them to pile up around the bomb. Once you have a bunch of them around one, then simply shoot the bomb and it'll explode, killing the zombies. To help with this process, take the Shockwave ability and the perk that allows enemies who are stunned by the Shockwave to take triple the damage. This will help keep Zombies in line and ensure that a bomb blast will kill them. In later rounds, Zombies have more health and some don't automatically die from a Bomb Blast.

How To Turn On The Power In "The Final Reich"

Video Credits go to "Laggin24x".

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How To Re-Route The Power To Open The Door Leading To The Salt Mine Tunnels Where Bombers Are Located

Video Credits go to "Carefree Llama Gaming".

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Red Mist Video Guide

Video Credits go to "PowerPyx".