The Concrete Bunker is a rare location and event that is featured in Death Road to Canada. It sets the player characters party in a large open field, north of where you spawn-- a concrete bunker can be located. Once entering the bunker you will be met with a large resistance of zombies.
The bunker usually contains large amounts of food and medicine, which can be found in neatly arranged cabinets that occupy some rooms. You also have a chance of finding firearms and weapons.