The World War II submarine was a surface ship which could submerge when absolutely necessary and for the absolute minimal amount of time necessary to save their scrawny little necks. The Japanese did have radar, both on surface ships and in planes after spring of 1944.
Still wars are to be fought and subs are to remain on the surface at 9 knots with radar operational at all times to search the greatest number of square miles of ocean surface to find and sink the greatest amount of enemy shipping.
Force the World War II sub down and keep him down and his productivity becomes zero and he dies quickly. The Germans experienced that. We, by not being bound to established procedures an innovating our way out of dilemmas during the war, found ways to spend increasing portions of the cruise on the surface and sinking Japanese shipping.
Let's put it this way. Germans, using highly defective strategy, tactics and equipment, succeeded in sinking a whopping 1% of total convoy tonnage during the war. American submarines, making up strategy as they went and getting more efficient as Japanese anti-sub techniques got better, sank 80% of all Japanese shipping.
When you quit fighting and start hiding you have lost the war. Submarine stealth is intended to be an offensive weapon.
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