how wide is the GIUK gap? Is it as narrow as the Taiwan Strait (less 50 miles since it has to share with China side)? Bohai Strait is not an international shipping lane.
Let's say your SOSUS is 1 mile away from Taiwan island. Is that good enough estimate?
Why only 50 miles? You do know that a SOSUS line can potentially pick up subs from THOUSANDS of miles away, do you not? A SOSUS array does not have to stray past the median line of the Strait to pick up sounds from across the whole strait. And yes, ALL of the choke points in the GIUK gap are similar in width to the Taiwan Strait; just look at a map. Also, Bohai Strait is not an international shipping lane??? Do you have any clue how much traffic goes through that Strait on a daily basis? Look at all the major coastal cities along the Bohai Sea whose only sea outlet is the Bohai Strait.
To be honest, I'm not sure why I'm even indulging in this outlandish fantasy of submarine-delivered troops. Not just the fact that they will easily be detected crossing the Strait is the fact that the cost-benefit ratio of this absurd troop transport method means that nobody in the PLAN with a sane head will be willing to fund it. You're not just talking about inserting special ops teams, you're talking about transporting "tanks" in a sub. LOL
I think Jackie says it best: