SOSUS was retired/handed over to the oceanographers decades ago....
One of my colleagues at TWU RAF Brawdy once greeted some US Navy SOSUS people from the 'Biscuit Factory' at lunch with the words "Hi - you must be the oceanographers?". Perhaps unsurprisingly, no replies were forthcoming!
(The NAVFAC was nicknamed the 'Biscuit Factory', because it was commanded by a Capt Jacobs at the time.)