Blast Doors is an Imperial level in Star Wars: Tiny Death Star.
Blast doors serve as an extra level of protection on spaceships from catastrophic leaks. Even a lightsaber has difficulty cutting through a heavily-fortified blast door.
Any bitizen, including those who did not request the particular floor, can be delivered to this level. If a resource is being assembled, doing so will cut one minute from the completion time.
The Improved Alloy is initially locked. It is unlocked when the Tractor Beam Imperial level is completed.
Re-enacting the duel from Star Wars: A New Hope, Obi-wan fights Vader in a lightsaber duel, and allows himself to be defeated.