Pipelines are a kind of terrain. They are indestructible tubes that supply power and raw materials to Black Hole's factories and cannot be passed through by any unit, except for Piperunners, which travel along them.
Although indestructible, they can be breached by destroying Pipe Seams. In maps without factories, they only act as a barrier forcing a player to find another way around. In this case, pipes are usually plentiful, located around entire bases with multiple seams to destroy. In factory maps, however, there is usually only one seam that must be destroyed to deactivate the factory and win the mission. Here, pipes are less plentiful or concentrated in one part of the battlefield.
- According to some calculations, the pipelines are likely only 3.048 meters (10 feet) tall, yet air units cannot fly over them.