Workers clean debris following an eruption of Mount Semeru, seen in the background, in Lumajang district, East Java province, Indonesia, Monday, Dec. 6, 2021. The highest volcano on Java island spewed thick columns of ash into the sky in a sudden eruption Saturday triggered by heavy rains. Villages and nearby towns were blanketed and several hamlets buried under tons of mud from volcanic debris. (AP Photo/Trisnadi)