Ralf-Reimar Wolfram

Ralf-Reimar Wolfram was a German Korvettenkapitän during World War II. During his career he commanded two U-boats for a total of 118 days at sea spanning four patrols. During his third patrol he successfully sank the SS Robert Gray, an American liberty ship. Robert Gray was a straggler from convoy HX 234 en route to Britain.

For Wolfram's fourth patrol, he commanded U-864 during Operation Caesar. He was killed when his submarine was sunk by the British submarine, HMS Venturer. This was the only known instance of one submerged submarine sinking another submerged submarine. U-864 remains Wolfram's grave to this day.