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Now to a cnn exclusive, look inside the uss hartford, nuclear powered submarine challenging russia in the arctic. jim sciuto got exclusive access to see how they deal with potential threats under the ice. >> reporter: more than 100 miles north of the northern-most tip of alaska, we set down on a runway carved into the arctic ice. our objective? u.s. navy submarine exercises called ice-x. cnn was granted exclusive acces access. >> it may not look like it, but it's moving all the time. this is the giant kaleidoscope of giant pieces of ice. >> reporter: a new front in the

And shipping lanes and new paths to wage war. >> we are well aware we are in a great power competition environment. and the arctic is one piece of that. >> great power competition, talking principally about russia, but also china? >> russia and china two of great powers that are trying to catch up with us as fast as they can. >> this year these exercises called ice x are taking on new emergency. british joined in first time and u.s. submarine forces are refocusing on mission dating to the cold war. >> one of the primary missions is to be able to leverage our offensive weapon like a torpedo aga...

>> now to a look inside the "uss hartford" a nuclear powered submarine challenging russia in the arctic. jim sciutto got extraordinary access with the navy to see how it deals with the potential threats from russia under the ice. >> reporter: more than 100 miles north of the northernmost tip of alaska, we set down on a runway carved into the arctic ice. our objective? u.s. navy submarine exercises called ice x. cnn was granted exclusive access. about three feet thick here is the ice, and it may not look like it but it's moving all the time. this is a giant kaleidoscope of giant pieces of ice. ...