Abstract: A door locking and sealing system is provided including a doorway having a floor, a wall mounted on the floor with a rectangular cut out formed therein, and a recess formed in the floor along a lower edge of the cut out. Also included is a door housing having an outer face, an inner face and a thin peripheral side wall integrally coupled therebetween for defining a hollow interior space. The peripheral side wall is defined by a top face, an inboard side face hingably coupled within the cut out of the wall, an outboard side face and an open bottom. A block is slidably situated within the open bottom of the door housing. Finally, a control assembly is provided for raising and lowering the block in and out of the recess.