On 2 August, a note was dropped from the window of a cell of Puerto Princesa Prison Camp on Palawan Island in the Philippines. It was picked up by an American soldier who was on a work detail nearby. The note was in turn given to H. D. Hough, Yeoman Second Class, who was also a prisoner at the camp. On 4 August, he contacted Trinidad Mendosa, wife of guerrilla leader Dr. Mendosa had more information on the survivors. From these sources, it was concluded "Robalo" was sunk on 26 July 1944, off the western coast of Palawan Island. The submarine was sunk by an explosion near her after battery, probably caused by an enemy mine. Only four men swam ashore, and made their way through the jungles northwest of the Puerto Princesa Prison Camp. They were captured by the Japanese Military Police were jailed for guerrilla activities. On 15 August, they were evacuated by a Japanese destroyer and never heard from again. Even though Admiral Christie knew better it was reported for morale reasons that all hands went down with the boat. However, other prisoners on Palawan reported that the boat's skipper Lt. Cdr. Manning Kimmel, son of Admiral Husband Kimmel, was one of the survivors. It is believed that after an air strike on Palawan the Japanese were so angry that they pushed Kimmel and other prisoners into a ditch, poured in gasoline and burned them alive. 