The Hoki Maru was transporting aviation fuel to the supply base at Truk. An aerial bomb hit the ship and it exploded in a fireball. The fire raged fiercely below deck, killing most of the Japanese crew.

The Nippo Maru is one of the deeper wrecks in Truk Lagoon. She was most likely sunk by a 500 lb. aerial bomb on the first day of the attack. The helm and compass on the bridge are signature features, as well as a large tank secured to the midship deck.

The Heian Maru was a Japanese passenger and cargo liner before the war. She was converted to a submarine tender, and carried a large number of torpedos intended for Japanese submarines.