Anything is hard to find out in the ocean, even a great big submarine. That's why NATO constantly practices the complex science of anti-ubmarine warfare. Russia has ramped up its submarine activity in the Arctic, and these are the NATO forces preparing to hunt them down.It's a complex exercise involving ships, helicopters, special planes, and other resources using some of the Military Alliance's most advanced equipment to uh detect submarines, to locate them once they are detected and to be able to track th ...