Digging holes in sand cliffs led to repeated landslides
56:30
The collapse of a large rock from the top of a sand cliff
39:59
Digging sand while other mine workers rake the sand
25:14
very hard and risky work‼️mining sand on a steep cliff in a rain
1:03:48
THE AVALANCHE OF SAND FROM THE TOP OF THE CLIFF WAS CARRIED OUT BY A MINER
1:18:58
The Central Sand Cliff Is Prone To Landslides
1:08:08
Started by an avalanche of solid sand cliffs
28:27
The workers built beautiful, durable stone bridges
40:36