أَوْ يُصْبِحَ مَآؤُهَا غَوْرًۭا فَلَن تَسْتَطِيعَ لَهُۥ طَلَبًۭا

Or its water will become sunken [into the earth], so you would never be able to seek it."

— Al-Kahf 18:41