Isn't this the one where you have to drop off Seals at a Russian Command Center? Well if it's that one, go deep and stay slow. Hug the seafloor. There should be some civilian tankers or oilers out there that go south towards your objective. Plan to go under one of these ships(using high frequency sonar) and match it's speed. It should be going over 10 knots. This will mask your own signature and allow you to rapidly get to the Seal drop off point. Also you'll need the HF sonar for mine avoidance If I recall correctly. Don't forget that you need to be at periscope depth and 2 knots or less to deploy the Seals. From the time you press deploy to when they actually deploy may take 5 minutes.
That should get you through. If this ain't the mission you're talking about, I apologize.