Submarines Lost during the Month of September = 4
USS S-5 (SS-110)
USS Grayling (SS-209)
Lost on September 1, 1920 when a practice dive went wrong and she sank bow-first, with her stern showing above the water. In a dramatic adventure, her exhausted crew was rescued during the next few days. Salvage attempts were unsuccessful, S-5 settled to the bottom and was abandoned.
Lost on Sept 9, 1943 with the loss of 76 men near the Tablas Strait. Grayling was on her 8th war patrol and sank two ships before being lost.
USS S-51 (SS-162)
Lost on Sept 25, 1925 with the loss of 32 men when it was sunk after collision with SS City of Rome off Block Island.
USS Cisco (SS-290)
Lost on Sept 28, 1943 on her first war patrol with the loss of 76 men in the Sulu Sea west of Mindinao.