The 88mm deck gun of the U-576 was used for surface engagements and could fire a variety of shells from the watertight ready-ammunition locker which can be found forward of the gun on the port side.
88mm Deck Gun
Image courtesy of Joe Hoyt, NOAA - Battle of the Atlantic expedition. Download larger version (jpg, 21.0 MB).

The 88mm deck gun of the U-576.

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