It is an scene of almost apocalyptic proportions.
Bystanders are dwarfed as they stand watching a tremendous rush of water gushing through gaps in a dam in China, part of a carefully-choreographed operation to remove silt from the Yellow River in Luoyang, in the Henan province.
This annual operation sees more than 30 million tonnes of silt sent downstream a year, with more than 390 million tonnes shifted this way over the last 13 years.
The Yellow River authority says such operations lowers the river bed in the lower reach of the river by an average of 2.03 meters each year.
The dam stands at 154m (505ft) tall and is 1,317m (4,321ft) wide. When it was built opened in 2000, following a six-year construction, it had cost US$3.5billion to construct