CDDA: Chapter IV
After making it through the harsh winter, our hero Jack Flanagan having escaped from the lab and faced impossible odds in the wasteland as a shopping cart hobo, he has now acquired a complement of four companions, he is now in charge of building a camp in the wilderness from which to direct his operations. He has constructed the bulk of his mobile command center, the Hypercube, with vast storage areas and a fully equipped crafting center, all solar powered.
A month into Spring, he finds a secret bunker whose entrance is tucked away in a utility shed behind a gas station, behind some lockers. After disabling the turrets at the entrance with an EMP grenade, he kills its zombified inhabitants when he hears some commotion behind the walls. With no apparent doors leading to the noise, he tunnels through a short stretch of solid rock to find an adjacent subterranean science lab.
Pic related: The entrance of the bunker.
