I have heard that there is also a secret level as a homage to id Software's game Doom, in their game RAGE.
Where can I find this level and what do I need to do in order to access it?
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To find the Doom level, you will need to travel to Gearhead Vault, within Subway Town. Once you're able to access this level;
Here is a youtube video detailing how to find this hidden room:
Finding this secret level will also allow you to find the Doom Marine bobblehead item: