1. Large screens feature high-definition underwater images, including polar seas and kelp forests. 2. In 1923-1926 Sergey Kravkov explored polar seas forming part of Ubekosibir expeditions. 3. The view reminded scientists of pack ice on a polar sea . 4. "' Anna W�hlin "'is a Swedish researcher on the Antarctic and the polar seas . 5. For the first time in 50 million years, we now have an open polar sea . 6. The 19th century's dream of an open polar sea has become the 21st century's nightmare. 7. The cutter Polar Sea tracked one of them, a Chinese vessel, deep into Russian territory. 8. At the time no one had attempted to reach the polar sea by this route. 9. There's nothing to the north but the polar sea and the cap of Arctic ice. 10. Because polar sea ice is already afloat, it has little direct effect on global sea levels.
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