The helmsman steers the boat left and right when on the surface and submerged. The main steering controls are the buttons on the box labelled BBC on the bulkhead just behind the chief engineer.
Unfortunately UBI, didn't think it important to actually give us the helmsman ....so you just have to imagine he is there!
The other two guys ( who appear and disappear ) are the planesman. They control the mini wing things (at the front and back of the sub ) which help the boat to go up and down during diving and keep it level when under water.
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