re: Hunt for red October about to be for real?

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Thanks to computer analysis of sound signatures, the sensors are good enough to not be fooled if a submarine is moving under a noisy surface vessel.

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True. The sonar systems have an acoustic signature data base of every active submarine and military surface vessel, friend or foe, and many commercial ones. These signatures are unique to each vessel and easily classified for I.D. purposes. It's quite an effort to collect them, the Brits and Norwegians help with Russian vessels.

The Navy runs a seabed acoustic listening array near the Bahamas, where they sail all our subs through and characterize our own acoustic signatures.

Our sub's sonar capability is to me the most amazing part of the technologies employed aboard them.