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