Shun Nomura, formerly in charge of Mitsui Oil Industry

He starts out by saying that Japan's chief supply of oil, before the war, came from America.

When the war started, Japan's oil had to be supplied by the Dutch East Indies.

One of the major factors in Japan's defeat, he says, was the activity of American submarines which cut off that source of supply of oil.

This lowered their petroleum supplies so much, he adds, that, at critical times, there wasn't enough fuel for airplanes to fly.

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