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 | 64k | K-4 (SS-35) underway prior to World War I, possibly in the Seattle, Washington, area when she was first completed in 1914.
| USNHC photo # NH 41972, courtesy of the US Naval Historical Center. |
 | 77k | K-4 (SS-35) photo possibly circa late October 1914 to October 1915, when she joined the Pacific Torpedo Flotilla, and operated along the coast of California, conducting constant exercises and experiments to develop the techniques of submarine warfare.
| US Navy photo courtesy of Robert M. Cieri. Partial text courtesy of DANFS. |
 | 387k | From outboard to inboard, what looks to be K-8 (SS-39), K-4 (SS-35), K-3 (SS-34) & K-7 (SS-38), at Pearl Harbor, Territory of Hawaii on the 14 of October, 1915. | US Navy photo from NARA, courtesy of Daniel Dunham. |
 | 70k | K-4 (SS-35) photo circa 1918.
| USNHC photo # NH 41963, courtesy of the US Naval Historical Center. |
 | 82k | Alert (AS-4) (1875-1922)
tied up at Kuahua Island, Pearl Harbor, Hawaii, while serving as a submarine tender, 22 August 1917.
Submarines alongside Alert include, from inboard to outboard, K-4 (SS-35), K-3 (SS-34) and either K-7 (SS-38) or K-8 (SS-39).
| USNHC photo # NH 42542, courtesy of the US Naval Historical Center. |
 | 77k | K-4 (SS-35) underway with a sister submarine, trimming down "ready for nose dive", circa 1918.
The second submarine is probably K-3 (SS-34), K-7 (SS-38), or K-8 (SS-39).
| USNHC photo # NH 41968, courtesy of the US Naval Historical Center. |
 | 108k | K-4 (SS-35) underway with a sister submarine, trimming down "ready for nose dive", circa 1918.
The second submarine is probably K-3 (SS-34), K-7 (SS-38), or K-8 (SS-39).
| USNHC photo # NH 41967, courtesy of the US Naval Historical Center. |
 | 72k | K-4 (SS-35) underway, circa 1918, with an airplane hovering distantly overhead.
| USNHC photo # NH 41971, courtesy of the US Naval Historical Center. |
 | 72k | K-4 (SS-35) underway, circa 1918, photographed from another submarine.
| USNHC photo # NH 41969, courtesy of the US Naval Historical Center. |
 | 95k | K-4 (SS-35) underway, circa 1918, with another submarine and a tanker in the distance.
| USNHC photo # NH 41970, courtesy of the US Naval Historical Center. |
 | 88k | K-4 (SS-35) running at periscope depth, circa 1918.
| USNHC photo # NH 41964, courtesy of the US Naval Historical Center. |
 | 65k | K-4 (SS-35) submerging, circa 1918.
| USNHC photo # NH 41965, courtesy of the US Naval Historical Center. |
 | 60k | K-4 (SS-35) underway, port side view, date and location unknown.
| US Navy photo from NARA # 19N13673, courtesy of Daniel Dunham. |
 | 421k | K-4 (SS-35) underway, starboard side view, date and location unknown.
| US Navy photo from NARA # 19N13877, courtesy of Daniel Dunham. |
 | 116k | Port side view of K-4 (SS-35) underway, date and location unknown.
| US Navy photo courtesy of ussubvetsofwwii.org. |