June 1943, off the Kamchatka Peninsula, she attacked her first target, a large sampan. Her guns set the vessel on fire, but as it burned, a Japanese destroyer appeared on the horizon and began closing the surfaced submarine at high speed. Three minutes later, the destroyer opened fire on the diving S-30. S-30 commenced an approach on the destroyer, but just as she reached firing bearing, she lost depth control. A few seconds later, the destroyer began depth-charging her. In the next 20 minutes, the destroyer dropped 33 depth charges. Others followed sporadically over the next five hours. S-30 then was able to clear the area. On 6 June 1943, S-30′s crew repaired all minor damage and began efforts to remove two torpedoes which had been crushed in the number-three and number-four torpedo tubes. The one in the number four tube was removed on 7 June 1943, but the one in the number-three tube remained until the completion of the patrol. On 8 June, S-30 headed down the coast of Paramushiro at the northern end of the Kurils. approached Onekotan, then transited Onekotan Strait and set a course for Araito. During the next two days, she sighted four targets but was able to close only the last two, merchant ships in column, contacted on 10 June (Dutch harbor date; 11 June local date). Fog closed in rapidly as she made her approach, then blanketed the area as she launched three torpedoes. Her crew heard two explosions but could see nothing. Post-war examination of Japanese records revealed that she sank the 5,131- or 5,228-gross register ton (according to different sources) cargo ship (ex-Jinbu Maru) — which was anchored in Kakumabetsu Bay on the coast of Paramushiro at the time — in the attack. During the ensuing depth charging by Japanese warships, S-30 began to move out of the area. Within two and one-half hours, she had left the pinging of the searching Japanese sonars behind. S-30 resumed her hunt for Japanese ships. On 12 June 1943, she again transited Onekotan Strait. On 13 June, she fired on a convoy, but missed. On 14 June, she departed the area, and on 22 June 1943 she returned to Dutch Harbor to begin extracting the damaged torpedo in her number three tube and commence refitting. Eighth war patrol On 5 July 1943, S-30 got underway on her eighth war patrol, which took her back