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Type XXI U-boat

LC control no.sh2013002533
Topical headingType XXI U-boat
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See alsoSubmarines (Ships)
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Found inWork cat: Kohl, F. The Type XXI U-boat, 1991.
http://www.militaryfactory.com, website, Sept. 6, 2013 (Type XXI U-boat)
Wikipedia, Sept. 6, 2013 (Type XXI U-boats were the first submarines designed to operate primarily submerged, rather than as surface ships that could submerge as a means to escape detection or launch an attack)