31. The expedition eventually failed to penetrate thick pack ice . 32. The next five months were spent sealing on the pack ice of the Barents Sea. 33. Ships would moor alongside seasonal pack ice , where longshoremen would offload cargo onto large sleds. 34. During the winter, it is surrounded by pack ice . 35. That evening, heavy pack ice completely crushed the lifeboat. 36. They had covered 295 miles ( 475 km ) and floundered on the pack ice . 37. Meanwhile, other ships moored near the northern shore after breaking up pack ice with gunfire. 38. And as soon as the pack ice sets in, they'll be gone within 48 hours. 39. However, in 2005 icebreakers encountered more than of pack ice blocking entry to McMurdo Sound. 40. Islands along the peninsula are mostly ice-covered and connected to the land by pack ice .
