Before revision: Door dog 300px|A hatch on USS Blue Ridge with the hatch dogsclearly visible The doors that allow passage through bulkheads between compartments inside a ship can be closed during emergencies to seal off one compartment from another, thus isolating flooding, smoke and heat from adjoining compartments.
After revision: Door dog Door dogs The doors that allow passage through bulkheads between compartments inside a ship can be closed during emergencies to seal off one compartment from another, thus isolating flooding, smoke and heat from adjoining compartments.