It’s on my shelf in sight! Yes, read it. And that was in the “olden days.”
Plus, that was far more tricky, intercepting cable comms.
Cutting the cables with cross-laid explosive linear charges fed out of a sub will be 1,000X easier.
I worked in optical comms for a while at Nortel Networks. The thought of intercepting undersea data was mind boggling when I read it.
I’m sure things have progressed way beyond what was revealed in the book.