Rock fired a spread of four torpedoes from her stern tubes at the closing Asashimo without scoring a hit.

That night Rock surfaced and found that her periscopes were excessively damaged and that her bridge had been riddled with shrapnel.

The submarine badly damaged one large passenger-cargo ship and sank the 7,126-ton transport Sakito Maru.

XVIII electric torpedoes, and it was also possible that one of those had made a circular run and sunk the boat, as happened with USS Tang.

On 6 April 1945, Asashimo escorted the battleship Yamato from the Inland Sea on Operation Ten-Go towards Okinawa.

All of her 326 crew members - as well as Commander Destroyer Division 21 (Captain Hisao Kotaki) - lost their lives.