I'm going to say "a qualified yes", because back when I had GWX 2.1 installed (pre computer crash) I remember being notified of a convoy on the approach to the Gibraltar straits. By the time I intercepted, the "AI Subs" were gone, but the convoy was in tatters, with seriously damaged and/or sinking ships all over the place and the excorts gone.

All I had to do was clean up the remnants for as long as I could before a flight of Hurricanes arrived to mess-up my party! Some time later I got a contact which turned-out to be a severly damaged U-Boot sitting motionless on the surface, unfortunately the game doesn't allow for crew rescue to be done.

I'm not far enough into GWX 3 yet, but I'm hoping against hope for a similar occurance later in this career!