I don't know if this justifies it, and it's a gross over simplification of a much more complex reality, but even with all 66 submarines deployed around the worl

I don't know if this justifies it, and it's a gross over simplification of a much more complex reality, but even with all 66 submarines deployed around the world, each one has over 2 million square miles of coverage. While it may seem like a lot of boats, the world is large, and it takes a lot of boats to be able to respond to a situation happening anywhere in the world in a timely manner.