"Mizar" took part in the search operations for "Thresher", the Palomares Incident in which nuclear weapons were lost off Palomares, Spain. The ship was engaged in the extended search for – which was found in October, 1968. She also took part in searches for foreign wrecks, including "Eurydice". In 1969 "Mizar" was called on to locate the Woods Hole Oceanographic Institute deep submersible "Alvin", fellow searcher off Palomares, had sunk in . "Mizar" lifted the submersible to shallow water. "Mizar" was not involved, despite speculation, in the search for the Soviet submarines "K-129" as the ship was well known to the Soviets and could not operate clandestinely.