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The Underground Garage can be purchased once the player has purchased an Office and a Vehicle Warehouse, where it is included in the latter. Unlike normal car garages featured in the game, only special vehicles acquired from Warstock Cache & Carry can be purchased for the garage. The vehicles are the:
- Ramp Buggy
- Blazer Aqua
- Phantom Wedge
- Rocket Voltic
- Technical Aqua
- Armored Boxville
- Ruiner 2000
The Underground Garage's entrance is located on the wall left of the main entrance inside the Vehicle Warehouse. A staircase will bring the player down a few levels, where they will be in a sewer like area, where the eight special vehicles from Warstock Cache & Carry can be stored. The left side of the room is where the Technical Aqua, Armored Boxville, Wastelander and Phantom Wedge is stored while on the right is where the Blazer Aqua, Ruiner 2000, Ramp Buggy and Rocket Voltic is stored.