And they can use that energy in case the wind falls away, and the tide is coming up, and there is still a little bit of energy to reach the dunes and save their lives, because they are drowned very easily.
万一風がやんだ場合や潮が満ちた場合に蓄積してある わずかなエネルギーを利用して砂の積もっている所までたどり着き 生き延びることができます　実は彼らは溺れやすいんです