Flooding holes/ Valves of French Surcouf submarine

[Kawasaki Monota]

I tried my best to search, search and search.... However I get nothing but some pics showing Surcouf in the drydock and I found it difficult to find...

[Kawasaki Monota]

Hi there, I have never seen any plans of blueprints showing the flooding holes or valves at bottom of that boat , the Surcouf. Does anyone knows that?...