intense battle for dominance as the ice shrinks and opens new oil exploration. new shipping lanes and crucially new pads to wage war. >> we are well aware that we are in a great power competition environment. and the arctic is one piece of that. >> great power competition and principlely about russia and also china. they are two of the great powers that are trying to catch up with us as fast as they can. >> spacex, taking on new urgency. a british submarine joined for first time in a decade. refocusing on a mission dating to the cold war. >> what is our primary mission to be able to leverage our offensive weapon like a torpedo against a threat. there's been a shift in emphasis