Severny Island stretches roughly 400 kilometers north of the Russian mainland, lying where the Barents Sea meets the Kara Sea. At nearly 49,000 square kilometers, it ranks as the 30th-largest island on Earth and the third-largest uninhabited island — a distinction that hints at just how forbidding the place is. Forty percent of the island disappears beneath the Severny Island ice cap, which is, by area and by volume, the largest glacier in Europe — if Europe is measured to include it. Most of those glaciers terminate at the eastern or western shoreline, calving into frigid seas. The narrow Matochkin Strait, barely a slit in the rock, separates Severny from its southern neighbor, Yuzhny Island. Once, a settlement called Lagerni existed on its northern shore. Nothing remains.

The island was historically known as Lütke Land, named for Friedrich Benjamin von Lütke, the Russian admiral and explorer who charted these Arctic waters in the 1820s. The renaming to Severny — simply "Northern" in Russian — erased the cartographic tribute, replacing the European discoverer's name with a directional fact. The climate makes the naming feel apt: a cold tundra climate in which temperatures barely scrape above freezing even in July, and winters where wind and darkness define the months. A meteorological station at Cape Zhelaniya, the northernmost point, has been keeping records for decades, sending data back to the mainland from one of the most isolated outposts on the planet.

The cape of Sukhoy Nos, at Severny's southern end, served the Soviet nuclear weapons program between 1958 and 1961. This remote coastline was chosen precisely because it was empty — a vast ice-and-rock testing range well away from populated areas. When the Tsar Bomba was detonated on October 30, 1961, its 50-megaton yield had been deliberately reduced from the original 100-megaton design to limit the radioactive fallout. Even at half strength, the fireball was nearly four kilometers wide. The shock wave shattered windows in Norway and Finland. A village that had existed on the island was leveled. Pilots of the delivery aircraft felt the shockwave despite being over 100 kilometers away when the bomb detonated. The test proved the Soviets could build a weapon of almost unimaginable scale. It also proved they had the sense, barely, not to build the full version.

Despite its history as a weapons test site and military installation, Severny Island today falls within the boundaries of Russian Arctic National Park — the same protected area that encompasses Franz Josef Land to the north. Walruses haul out on the rocky shores; polar bears roam the ice. Cape Zhelaniya, jutting into the Kara Sea, has become a gathering point for wildlife watchers willing to make the rare expedition north. The island's numerous glaciers have their own drama: rivers of compressed ice inching toward the sea, their blue-white faces cracking and groaning as they calve. A millennium of accumulation ends in a splash at the waterline. For all that happened here in the Cold War, nature reasserts itself with patient indifference.