On 13 June, "Sea Dog" was still off Oga Hanto. That evening, the starboard mine clearing cable, installed during the previous refit at Guam, parted and fouled the starboard screw. "Sea Dog" cleared the Japanese coast and stopped, lying-to while attempts were made to get divers down. Leaks in the face mask of the shallow water diving outfit, however, proved impossible to repair; and, soon after 0130 on 14 June, the submarine got underway. The noise and vibration from the starboard shaft was found to occur only for short periods at low speeds. At high speeds, its performance was satisfactory, and "Sea Dog" resumed her patrol, setting a southwest course for a surface patrol across the approaches to Akita, Sakata, and Niigata.