At 02.46 hours on 30 July 1941 the unescorted Sitoebondo (Master Antonie Verhoef), dispersed from convoy OS-1, was hit by a torpedo from U-371 southeast of the Azores, after they had witnessed the sinking of Shahristan about one hour earlier by the same U-boat. She sank after being hit by two coups de grâce at 02.54 and 03.37 hours. The 71 crew members and six passengers had abandoned ship in three lifeboats after the first hit when the ship settled by the stern. The occupants of two boats were picked up by the Spanish tanker Campeche the next day. Two crew members on a raft were rescued by the Spanish tanker Campero after about six days. The third boat with twelve crew members and two passengers was never found.