A massive rock and ice avalanche caused the 2021 disaster at Chamoli, Indian Himalaya. - Shugar DH; Jacquemart M; Shean D; Bhushan S; Upadhyay K; Sattar A; Schwanghart W; McBride S; de Vries MVW; Mergili M; Emmer A; Deschamps-Berger C; et al. (Science (New York, N.Y.), 2021)