Even giving the Soviet Boomers the benefit of the doubt, once any of them began to open doors, flood tubes or even launch, their positions would be pinpointed and it would be much easier to sanction any Soviet forces in the area. Attrition would be high if used as a first strike weapon, even if they were not tracked. Transient noise can be heard for quite a distance under water.
That being said, they would have stood a decent chance of being able to clear their tubes if fully committed, while their escorts played torpedo tag with the US/UK SSN's.
On the topic of Diesel subs...there has long been a problem with tracking modern D-subs with sonar. The issue is, that unlike nuclear subs, who's nuclear reactor requires that a water pump constantly be functioning to bring cold water in to cool the reactor, the D-Subs run on a battery powered electric motor with few moving parts to drive it...so it is extremely quiet. The USN has long recognized the danger of modern D-Subs, with tactical assessments being done on subs acquired by China and North Korea during the great Soviet Naval garage sale days. (THAT'S RIGHT EVERYTHING...MUST...GO!!)
The Soviets knew about SOSUS, and would have moved to disrupt it. There is no system that is perfect.
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