1958, August 3.... the United States Navy submarine USS Nautilus (SSN-571) crossed the North Pole.  1959, March 17....the USS Skate (SSN-578) surfaced at the Pole, becoming the first naval vessel to do so. 1986, May 6....the USS Archerfish (SSN 678), USS Ray (SSN 653) and the USS Hawkbill (SSN 666) surfaced at the north pole, the first tri-submarine surfacing at the North Pole. 1986, May 18....the USS Billfish (SSN 676), USS Sea Devil (SSN 664) and the HMS Superb (S 109) surfaced at the north pole, the first international surfacing at the North Pole. 2005, the United States Navy submarine USS Charlotte (SSN-766) surfaced through 155 cm (61 in) of ice at the North Pole and spent 18 hours there.

2007, August 2....a Russian scientific expedition Arktika 2007 made the first ever manned descent to the ocean bottom at the North Pole, to a depth of 4.3 km (2.7 mi), as part of a research programme in support of Russia's 2001 extended continental shelf claim to a large swathe of the Arctic Ocean bottom. The descent took place in two MIR submersibles and was led by Soviet and Russian polar explorer Artur Chilingarov. In a symbolic act of visitation, the Russian flag was placed on the seabed at the exact position of the Pole.....The expedition is the latest in a decades-long series of moves by Russia intended to show that it is the dominant influence in the Arctic. The warming Arctic climate and summer retreat of sea ice there has suddenly turned the attention of countries from China to the United States toward the top of the world, where resources and shipping routes may soon be exploitable.