To control buoyancy, the fuel or ballast tanks - which can add weight - can be emptied and used to lift the sub. To achieve this, the diesel fuel or ballast is released, emptying the tanks ...

Shaped like an enclosed rowboat, the vessel included ballast tanks for stability and a system ... world's navies have long used highly developed submarines in military operations, scientists ...

Then, the rear of the submarine began to tilt upwards as the rear ballast tanks gradually filled with air. Hager was relieved. “You could feel the pregnant pause, and the almost the relief when ...

Tubes), as was done when too late, instead of to the ballast tanks, as was done at first ... of the S-4 disaster and safety devices for submarines, but on the efficiency of the Navy in general.