I've always thought this to be some kind of emergency exgress hatch because I've seen the same pattern on similar "hatch" like structures on a lot of different submarines. I used to have a huge book that documented just about every submarine post-World War II to about 1998. It had cross sections, weapons/equpment load outs, etc., etc. From what the book documented in photos and drawings a large majority had such a hatch.
I also remember seeing a quite mammoth Soviet sub that was dedicated to search and rescue. It had two smaller submersibles that it carried in berths on the aft deck. Both of them carried a red and white color scheme that was similar.
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