In a congested harbor? Yeah, good luck finding a submarine. (Though my above post wasn't about Seattle)
All i need to do is sail in the deepwater section of the port, dump my divers, they swim the 2-3mi to the carriers, dump charges and boom.
Been done before actually.
that said, I'm also implying the carriers have been abandonded/not staffed, because if they where staffed there's no way they would sit in port waiting for the Californians or Alaskans to capture them.





