The exercise assumed the mobile naval base defense organization could protect an Okinawan harbor against submarines, destroyers, and aircraft within a week. Booms and minefields followed, but the guns remained inadequate against bombardment and the position could not repel a major amphibious assault. Cruisers and submarines would use the base to attack Japanese trade around Shanghai and the Yangtze. Singapore supplied the rear support in the scenario, with a protected anchorage, storage and repair facilities, 500,000 tons of oil fuel, and a 40,000-ton floating dock. These specified facilities show how much support the advanced force depended on even before considering the enemy fleet.
Notable Point · 41:50-42:30
What an Okinawan advanced base needed to operate
Rapid base construction in the exercise still left weaknesses against bombardment and landing, while operations depended on substantial facilities at Singapore.