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I'm working on a cutaway of the P-2 (or U-2??)

What are the three pressure hulls labelled '4'? The annotation says "midget submarines' but I am not sure if that is the correct translation.

Online sources

http://militaryrussia.ru/blog/topic-711.html

http://www.deepstorm.ru/DeepStorm.files/45-92/dns/p2/list.htm

http://coollib.com/b/186531/read

http://www.submarine.itishistory.ru/1_lodka_35.php