A lot of S class boats did not have that voice tube by design. According to Stephen Jenner (1st Lt HMS Sibyl) these sorts of things were left entirely to the individual captain who would request modifications to his boat after each patrol. He could even choose the paint job, if they had that color in the depot ship.
I think that by the end of the war, these guys were also beginning to realise that all this crap strapped to the hull caused a lot of noise in the water and made them easily detectable, and so started to shed all sorts of things, hence the advent of The Slippery T class.
I think that by the end of the war, these guys were also beginning to realise that all this crap strapped to the hull caused a lot of noise in the water and made them easily detectable, and so started to shed all sorts of things, hence the advent of The Slippery T class.
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