Mackerel-class submarine
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The Mackerel-class submarines were a pair of experimental prototype submarines built just prior to World War II and launched in 1940 and 1941. The two submarines were similar in size and capability to
USS Mackerel (SS-204)
The United States' S-class submarines, often simply called S-boats, were the first class of submarines with a significant number built to United States Navy designs. They made up the bulk of the USN s
S-class submarine USS S-44 (SS-155) leaving Guantanamo Bay, Cuba, c. 1929
USS S-1 off Provincetown, Massachusetts, on 17 April 1920, while running sea trials
USS S-2 backing at low speed, probably off Bridgeport, Connecticut, at the time of her builders' trials in September 1919, many of the men standing on her deck are civilians
Portside view of USS S-3 on her trials, May 1919, notice the complete lack of an enclosed bridge fairwater, or her 4"/50 caliber gun, a features that were added later