I wasn't doubting the stealth stuff, or even the depth issues (I personally build equipment that tests to over 600 metres depth), but what sounds like basic bulldroppings is:
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tracking submarines with some cute water penetrating long wave length radar. And because there is three of them they do their own trig calculations to determine the depth of the submarine. Pretty neat hey! Sort of like active GPS you don't want!
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There's no way radar will EVER penetrate to even a fraction of the depths stated. They actually use passive interception of radio/radar for location of surface shipping.
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these subs are capable of speeds in excess of 160 KMH
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Umm, no, even your quoted source says 26 to 30 knots, which is around 50 kmh.
Cheers,
Jason.