[Kazuaki Shimazaki II]

Originally Posted by Schroeder

Sometimes I wonder whether half of the British forces are actually working for the other side.

There was nothing sensitive in those blacked out portions. Here's one:

Control of submarine depth. For all submarine operations, depth is controlled by a combination of hydrostatic lift (by adjusting the ballast of the submarine) and dynamic lift (using speed through the water and control surfaces). US established practice is to deliver a high reliability of propulsion, from the main propulsion system, even under reactor fault conditions. UK practice in current class submarines is to accept a much lower reliability from the main propulsion system, and to back this up with a very low power (but high reliability) emergency propulsion system. This system will not provide sufficient dynamic lift, so safety is achieved by procedural controls constraining the combinations of speed and depth, backed up by use of ballast systems (but this may not be effective under all circumstances).