In "Call Of Duty: Zombies", completing which map's main easter egg will reward you with the achievement, "High Maintenance"?

The main Easter egg in the map "Die Rise" in Call of Duty Zombies, known as "High Maintenance," rewards players with the achievement of the same name. The Easter egg involves a series of complex tasks and puzzles that players must complete in order to unlock the achievement. These tasks include obtaining different parts, activating switches, and navigating through challenging areas of the map. By successfully completing the main Easter egg in "Die Rise," players are rewarded with the "High Maintenance" achievement as recognition for their skilled gameplay and perseverance in solving the intricate puzzles within the map.