Even then though, I don't fully buy TOFU's B777 parallel
of course - apples and oranges
But I was making the point that the ocean is a hostile environment and submarine is the master of it (27 years before the mast teaches you that). The idea that they will become "easy" to find anytime soon exists only in fiction. In fact I would suggest that our ability to develop ASW capabilities (probably throughout western forces) is a tad "sluggish" just now. (Deliberately understated to avoid pprune hysteria).
That's why the five full nuclear states (USA, Russia, UK, France and China) all stick their second strike buckets of sunshine in them.
It's a real bugger when inconvenient facts get in the way of a cost saving isn't it?