After a space of 11 years, Russia successfully tested an intercontinental missile from a K-84 nuclear submarine from below the ice in the North Pole and hit targets at a testing range in Arkhangesk while another fired at the same target from the Pacific Ocean.
While firing from under the ice cap is very difficult because of speacialized navigational and personnel experience requirements, its submarines are also virtually undetectable by enemy radars and even if found can be hard to hit.