We're only really learning about this now because scientists couldn't get to the area before because of ice in the sea blocking the way.
我们现在才真正了解这一点,因为科学家之前无法到达该地区,因为海中的冰挡住了道路。
英语百科
Ice blocking
Ice blocking is a recreational activity in which individuals race to the bottom of a hill sitting on large blocks of ice. In the United States ice blocking is thought to be regional, occurring in the West. The sport has a long-standing tradition at Southern Nazarene University (Bethany, Oklahoma), where the Student Government Association holds the event annually.