That is why you should transit the strait submerged. Just find a couple of tankers going your way and slip in between them. Maybe it is hard to find a tanker these days.
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While you are correct, underwater transit is the proper way to do it and going between other ships is good camouflage, the straits are only about 200 feet deep at worst spots so that makes it somewhat tricky, or at least not routine. There are places in mid channel where the depth is several times that deep well over 1000’ but the shallowest point is what you really care about. Some tankers will have a 60’ draft. There is so much traffic in the straits that sonar will be hollering out contact information the whole passage. It doesn’t leave a lot of room for error. If another submerged object is transiting at the same time you would hate to run into them at high speed, bad enough at 3 knots. It is easiest to go through when the tide is going the same direction you are, you only have to make enough turns to give steerage, hardly anyone will hear that going through the very noisy strait at that speed.
All I can tell you is it works. It helped that we had the prototype for the secure fathometer. In fact, our INS had failed and we were navigating on bottom contours.