Infested bunker

The infested bunker is a zerg structure.

Game Structure
The infested bunker works similarly to a terran bunker. Most can only load terran infantry. If viewed in a custom map, the tooltip says "must be destroyed if infested". They appear in the campaigns of Wings of Liberty, Heart of the Swarm, and Nova Covert Ops.

The infested bunker is also found in Left 2 Die. In that mission, at least one can fit inside one, and it emerges when the infested bunker is destroyed.

Infested bunkers can be built by Alexei Stukov in Co-op Missions. They can walk around, attack, and generated infested troopers inside themselves. They can be unloaded.

Development
The infested bunker was going to be a produceable campaign unit for Heart of the Swarm, it would have spawned by emerging from underneath a terran bunker, warping the metal into itself, gaining a back-mounted cannon in the process. The unit was put into storage before being revived for Co-op Missions.