Unwatering Flooded Compartments (MN-6774) is a short 1950 educational film on damage control from the U.S. Navy. The film briefly reviews the different types of permanently installed drainage systems on a ship and then gives a good overview of the various auxiliary portable equipment that can be used for unwatering a flooded compartment. The film opens with a shot of a Navy carrier at sea, unlevel as it is taking on water. Graphics are used to show how flooded compartments can progress, exacerbating the situation. The film then shows several types of permanently installed drainage systems (01:43), including a steam-driven pump, a motor-driven centrifugal pump, and eductor pumps (01:59). A man turns the wheel on an eductor. A sailor operates the controls of the ship’s drainage system. A hole below the water line leaks water into a ship (03:32). The film then shows the various portable equipment all grouped together (03:50), including a P-500 pump, a Handy billy pump, a portable electrical submersible pump, an eductor pump, and a bucket. Two men show the electric portable submersible pump (04:25), and then graphics are used to explain the construction of the pump and how it functions. A man connects the hose line to the pump then places it into a screened basket. Next, the film shows a fluted perforated metal strainer that can also be used for the pump. The men lower the pump and its strainer basket into the flooded compartment and then turn it on. Water is pumped out through the hose and sprayed overboard (06:41). The men pull the pump out from the flooded compartment (07:30). Next, the two men fit a hose on a gasoline-powered Handy billy pump (08:16). They prime the engine then start the pump. A P-500 (09:23) is shown next, which is similar to the Handy billy but can handle a larger capacity of water. A man hooks up the discharge hoses to the pump. The other sailor primes the pump before starting it (10:11). There is a shot of the machine’s discharge pressure regulator. On deck, men open hose nozzles and spray water overboard. The film shows an eductor jet pump next (12:14); graphics show how the device works. Two men connect hoses to the eductor, then lower it into the compartment. A Perry jet eductor pump is shown next (13:52). Graphics are again used to show the details of the design. A sailor hooks a hose up to the fire main to get required water pressure (14:58). A man operates a Perry jet pump in a display set up on a dock (15:07). Two men lower the Perry jet pump into the flooded compartment. The film concludes by reviewing the steps to contain flooding and unwatering flooded compartments.

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