They have to drill holes in the ice, dive down into the water -- cold, cold water -- to get hold of the instrument, bring it up, do any repairs and maintenance that they need to do, put it back and get out before the ice melts.
彼らは 氷に穴をあけ 冷たい水の中を潜ります 装置を引き揚げて 必要な修理や手入れを行い 氷が解ける前に それを水中に戻して立ち退かなければなりません