21. During spring and early winter, rivers may become impassable due to freezing or thawing ice flows . 22. On one occasion the base's HUP-1's retrieved 17 fishermen stranded on an ice flow during a snowstorm. 23. Glacier retreat has been observed in these outlet glaciers, resulting in an increase of the ice flow rate. 24. Seasonal melt ponded and penetrating under glaciers shows seasonal acceleration and deceleration of ice flows affecting whole icesheets. 25. Regular measurements of the ice flow coordinates provide the data on the direction and speed of its drift. 26. The three aided Aleu in her return to the ice flow , resulting in her takeover of the pack's future. 27. However, Perutz found a problem : ice flows slowly, in what is known as sag unless it was cooled to. 28. Another danger now looms-- icebergs-- since the racers are coming up to the northern limits of the Antarctic ice flow . 29. Then, according to official reports, a block of ice fell from Kolka ice flow , bringing with it mud and large boulders. 30. The fjord has no marked threshold as the glacial ice flow joined that from the Hylsfjord and flowed into the Sandsfjord.
