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As for speed, the best way to hide is not going fast. In fact, higher speeds increase the chance of cavitation. My boat, the USS James Madison, was virtually undetectable when cruising low & slow. In fact, when we came out of the shipyards and went to sea trials, we were included in ASW training with the a surface fleet group. Ever participated in that? The sub has 3 colors of flares. Red for a hit on us. Green for a hit on the skimmers. And yellow when our position was requested. The training was cut short when we ran out of yellow flares. If you can find out who was the CO of the USS America in the mid 1980s, ask him about a polaroid pic he received in the mail. It was taken through the USS James Madison's periscope. We came to periscope depth directly behind the America and the Old Man took the pic, wrote "Gotcha" on it and mailed it to the CO of the America.