1596
The Willem Barents expedition set out in search of a northeastern passage
to Asia. Bear Island (Spitsbergen Archipelago) was discovered.
  Willem Barents and the bear that the island was named for.  Wikimedia
The expedition led by hunter Fedot Popov and explorer Semyon Dezhnev.
A strait between Asia and America was discovered (Bering Strait).
  The Bering Strait, connecting the Chukchi Sea and Bering Sea. Chukotka Autonomous Area.  RIA Novosti
The Great Northern Expedition (1733-1743): a series of expeditions along the Siberian Arctic coast to North America and Japan. As a result of the expeditions, the Arctic Ocean shores, Kuril Islands and Honshu Island were put on the map.
  A 1745 map based on the results of the Great Northern Expedition.  Wikimedia
The expedition (1820-1824) led by Pyotr Anjous mapped the New Siberian Islands.
  A resident of the New Siberian Islands — the Arctic fox.  Yaroslav Nikitin
In 1821-1824, explorer Fyodor Litke mapped the coastline of Novaya Zemlya and explored the deep waters and dangerous sandbanks of the White Sea.
  Fyodor Litke.  RIA Novosti
The discovery of Franz Josef Land during the Austrian-Hungarian expedition led by Karl Weyprecht and Julius von Payer.
  Cape Tegethoff, Hall Island, Franz Josef Land.  Yaroslav Nikitin
On April 15, a resolution by the Presidium of the USSR Central Executive Committee delimited the boundaries of the Soviet Union’s northernmost territories.
  A still from the film, “Where the Meridians Converge.”  RIA Novosti
Arctic explorer Otto Schmidt, aboard the icebreaker Sibiryakov, made the first non-stop voyage through the Northern Sea Route during one navigation season.
  Otto Schmidt.  RIA Novosti
In June, Valery Chkalov (captain), Georgy Baidukov (second pilot) and Alexander Belyakov (navigator) made a nonstop flight from Moscow through the North Pole to Vancouver.
  The plane that made a nonstop flight from Moscow through the North Pole to Vancouver.  RIA Novosti
North Pole 1, the world’s first Soviet polar research drifting station,
was opened.
  The North Pole 1 drifting station.  RIA Novosti
The K-181 nuclear-powered submarine under the command of Capt. 2nd Rank Yury Sysoyev surfaced at the geographic North Pole. Soviet state and naval flags were installed in the ice.
  Yury Sysoyev.  RIA Novosti
During an expedition led by Timofei Guzhenko and Captain Yury Kuchiyev, the Arktika nuclear-powered icebreaker was the first surface ship to reach the North Pole.
  The Arktika breaks through the Kara Sea ice.  RIA Novosti
The Mir submersible performed the world’s first manned descent to the seabed under the geographic North Pole, taking soil and flora samples and planting a Russian flag on the bed of the Arctic Ocean.
  The Mir 1 deep submergence vehicle.  RIA Novosti