The aft section of the U-576's conning tower, also known as the wintergarten, which served as a platform for the 20mm anti-aircraft flak gun.
Wintergarten
Image courtesy of Joe Hoyt, NOAA - Battle of the Atlantic expedition. Download larger version (jpg, 11.3 MB).

The aft section of the U-576's conning tower, also known as the wintergarten.

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