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Usually just called “tunnel”, this is a rush map. If done correctly, you shouldn't even try to destroy any of the turrets. The key to running this map quickly are in using Green_Perks#Rubberized_Hull and Blue_Perks#Reverse_Thrust. The reason these two perks are so important is that the way to get through two sections of the tunnel, you need to pull yourself across the floor while shielding yourself from turrets above. Rev is necessary to propel yourself along the floor, and Rubber is necessary to limit the damage accumulated from constant interaction with the floor.