I have the same problem
I'm also having this problem using DW 1.04. I've attempted this mission about 20 times with the Akula. Most of the time I get detected. When I manage to avoid that, most of the time the special forces raft goes haywire -- driving sideways at high speed in seemingly random directions. After about 10 failures I developed the tactic of maneuvering nearly inside the special forces drop zone, so that even if it goes crazy, it'll usually still intersect the drop zone by chance.
With that done, the rest of the mission seems pretty easy. I can pop up the periscope and visually detect the patrol ships. Doing those two things -- deploying special forces and visually detecting the patrol ships -- triggers the 'Prevent ships from leaving' goal. More specifically, it spawns a new group that contains five ships and one trigger. The trigger fires, IIRC, so I assume the group was created, but no ships ever try to exit. In fact, I've looked with Show Truth, and none of the five ships ever appear! No ships start going anywhere either. I've also tried damaging all the ships on the map, but it didn't ever help.
This is so frustrating! It seems just impossible to complete this mission. Does anybody know what to do? :-(
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