They are bollards, when "ready to dive" the crew lower and secure the bollards.
@Novice the SM39 you have drawn is way too big. The F17mod2 torpedo is much bigger than the SM39 missile (which is painted white ...).
Indeed these are bollards, and they appear on the original as well as the drawing from the SHD (French Defence History site).
Missile and torpedo are from the parts sheet as I couldn't find any pictures of French torpedoes
so if any one have any source material or wants to draw the torpedoes, than he's more than welcome.
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Thank you Kim for the crest
"Never fear to try on something new. Remember that the Titanic was built by professionals, and the Ark by an amateur"