That's so naive. Those robot submarines will be useful for local defense but they lack the range, speed, and staying power to project power and protect sea line

That's so naive. Those robot submarines will be useful for local defense but they lack the range, speed, and staying power to project power and protect sea lines of communication over thousands of miles on a sustained basis. The notion of doing that with robots remains firmly in the realm of science fiction today. Maybe in 30 years.