That looks like a wash bucket strapped to a torpedo!
Did some looking up....
“Kaiten (回天, literal translation: "Turn the Heaven", commonly rendered as "turn of the Heaven's will", "the heaven shaker" were crewed torpedoes and suicide craft, used by the Imperial Japanese Navy in the final stages of World War II.
The very first Kaiten was nothing much more than a Type 93 torpedo engine compartment attached to a cylinder that would become the pilot's compartment with trimming ballast in place of the warhead and other electronics and hydraulics. The torpedo's pneumatic gyroscope was replaced by an electric model, and controls were installed which gave the pilot full control of the weapon.”
“In the end, Kaiten proved to be a disaster-within-a-disaster, a foolhardy experiment within a misguided war. More Kaiten pilots and supporting submarine crew members died in training and on missions than the number of sailors they managed to kill on the American side.”
IJN battleship Musashi, shown here firing her 18.1 inch guns, the largest guns ever mounted on warship. She was sunk on this date, October 24, 1944 after a determined and prolonged attack by US Navy aircraft. 19 torpedoes and at least 17 bomb hits were needed to sink her !!
I wondered if there were any pictures of the Musashi under air attack.
I only found the one pic.
"Japanese Battleship Musashi under heavy air attack by USN Aircraft during the Battle of the Sibuyan Sea - October 24, 1944 Despite Japanese attempts to save her, Musashi capsized and sank later that day, she had been hit by an estimated 19 torpedoes & 17 bombs."
Yasuji Okamura (1884/1966), commander-in-chief of Japan’s China Expeditionary Army, signs and presents the Japanese Instrument of Surrender to Chinese General He Yingqin (1890/1987), Nanking 9 Sept 1945.