USS S-21, Naval submarine in Maine, United States
The USS S-21, a diesel-electric submarine measuring 76 meters in length, featured advanced sonar systems and extended underwater navigation capabilities.
Commissioned in 1922, this S-class submarine served the United States Navy during the interwar period, primarily conducting training exercises along the East Coast.
Military technology museums across the United States display models and photographs of S-class submarines to demonstrate naval engineering progress of the 1920s.
The submarine carried a crew of 42 members and maintained an underwater endurance of several weeks through a combination of diesel and electric propulsion.
Located at coordinates 43.6147°N, -69.9903°W, the USS S-21 represented early developments in submarine warfare with its dual-propulsion system and diving capabilities.
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