Stern Dive Planes:
The bow and stern planes control vertical motion through the water.
These are horizontal rudders, attached in pairs to either side of the
hull, at bow and stern.
Angling these planes up or down causes the boat to rise or sink.
The boat itself is normally kept as close as practical to neutral
buoyancy, which is the point at which it will neither rise nor sink. In practice, the stern planes are normally used to control
the angle of the boat in the water, while the bow planes are used to
make it rise or sink. Stern dive planes on the Batfish are not
visible (they would be below ground level) and were more than likely
removed. The photo of the USS DRUM shows the dive planes and the