Hikawa Maru
On 1 December 1941, a week before Japan's attack on Pearl Harbor, the Mitsubishi Zosen dockyard at Yokohama started to convert "Hikawa Maru" into a hospital ship, completing work on her on 21 December. She treated Japanese casualties from the US Task Force 8's attacks on Kwajalein and Wotje atolls in February 1942 and repatriated the seriously wounded to Yokosuka. On 15 June 1942 the brought about 500 Japanese wounded from the Battle of Midway to Hashirajima, where they were transferred to "Hikawa Maru".