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18th century Academy of Science aeroplane air expedition airmen April Arctic Ocean area of relative Arkhangelsk Atlantic bathymetrical map Bering Strait carried Central Arctic basin changed Chelyuskin Cherevichny Chukchi Sea coast depth direction discovered discoveries drifting ice drifting stations earth's magnetic field eastern expedition led flights floe flying laboratory Franz Josef Land Georgy Sedov Greenland Sea hydrological ice conditions ice drift ice-breaker ice-drift ice-fields ice-packs investigation Kara Sea Kotov Laptev Sea latitudes Lena Lomonosov Range magnetic anomalies magnetic pole mainland slope meteorological mobile detachment navigation North Pole-3 Northern Sea Route Novaya Zemlya Novosibirskiye Islands observations Ostrekin Pacific Papanin pedition penetration pilot polar night recent region rock formation Rusanov Russian explorers sailed Sannikov Land scientific station scientists sea bed Severnaya Zemlya ships Soviet explorers Soviet Union Spitsbergen station North Pole-3 Taimyr Peninsula tion Titlov underwater vicinity Vladivostok voyage weather western Wrangel Island