When some of the Combined Fleet staff (specifically Admiral Ugaki) balk at the idea of sending badly needed destroyers to escort the Mirai, Lt. Commander Taki proposes that a new submarine, the I-21, be sent instead, with himself on board to observe. Yamamoto reminds Taki that he is essentially protecting Japan’s future — and without Japan, there is no navy. However, Taki retorts — silently — that without the navy, there can be no Japan. In Japan, Kusaka and General Ishiwara develop a plan to create Kusaka’s vision of Zipang, an undefeated Japan, with its economic heartland in Japanese-dominated Manchuria. Specifically, Kusaka reveals the 1959 oil strike at Daqing, Heilongjiang Province, in Manchuria, which could supply many times Japan’s needs for decades.