As much as the aircraft carrier revolutionized naval warfare(and it was a big revolution) it was the subs that brought Japan to its knees. Nothing got in or out of Japan. No raw materials in from asia and nothing left to go to the warfront without having to run a sub gauntlet. The amount of tonnage sunk is insane

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The Submarine Service accounted for about 55% of all Japanese tonnage sunk in the war. This was done by a branch of the Navy that accounted for about 1.6% of the Navy's wartime complement.

The Japanese lost 1,178 Merchant Ships sunk for a tonnage total of 5,053,491 tons. The Naval losses were 214 ships and submarines totaling 577,626 tons. A staggering five million, six hundred thirty one thousand, one hundred seventeen tons, (5,631,117 tons), 1,392 ships.

Japan ended the war with a bare 12% of her merchant fleet intact but not fuel at hand to run more than a few of them.
Source

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You never knew you were under attack until the side of your ship exploded. Evan today, the bastards are extremely lethal and impossible to find.