The technology to detect submarines is said to exist, but has its limitations. As always, it a competition between building stealthier submarines and better sensors.abc123 wrote:Also, if sattelittes are able to discover submerged submarines, then nobody would build subs anymore, right?
I suspect that any orbiting platform would also be looking for salinity changes (gotta get rid of all that generated fresh water somehow) and evidence of submarines wake (minute sea level changes as water is displaced upwards by a submarine moving below the surface).
Agreed that ICBM launches are different from Cruise missile launches, but the heat generated by both are probably at least five orders of magnitude greater than the temperature changes generated by a submarine underwater (>1000 C vs 0.01C ), so relatively easy to monitor for over a large area, then zoom in for detail when something is detected