A bulkhead is the door separating segments on the station. Energy () is usually required to open unoccupied segments. If the segment is occupied by an enemy opponent the bulkhead will have to breached by a security scuzzer during a takeover.
When a Bulkhead door is closed any building placed over the line will be destroyed. This has the same result as repacking a building, it will turn back into blueprint and item crates, along with a certain amount of litter.
The bulkhead doors of the biodeck are semi-circular and will fold down and sink into the nanosoil, leaving the area clear.