C-Class submarines in the Gatun Locks, Panama Canal, circa 1914
Photograph printed on a color-tinted postal card, prior to World War I. The submarine present include (in no particular order): USS C-1 (submarine # 9); USS C-2 (submarine # 13); USS C-3 (submarine # 14); USS C-4 (submarine # 15); and USS C-5 (submarine # 163). Security concerns about this photograph may have prompted the official correspondence reproduced in Photo # NH 85276 (extended caption). Courtesy of Commander Donald J. Robinson, USN(MSC), 1975 U.S. Naval History and Heritage Command Photograph.