A parabolic antenna can create a narrow beam. That beam can be aimed at a satellite. It is only necessary for the antenna but not the submarine to be at the surface.
The long usage history of sonobuoys and underwater decoys in submarine warfare seems reason to suppose that the use of similar sacrificial systems within the realm of possible tactics to further avoid detection of a submarine.
The long usage history of sonobuoys and underwater decoys in submarine warfare seems reason to suppose that the use of similar sacrificial systems within the realm of possible tactics to further avoid detection of a submarine.