A construction worker in the southern Chinese province of Guangzhou has been killed after falling into a 4m-deep septic tank.
The worker, who is known only by his surname, Ma, is thought to have fallen into the sewage as he arrived at work in the night, when he was unable to see the danger.
Ma, who job involved moving cement around the site, was due to start work at 3.30am.
When he failed to appear, an hour-long search took place, which eventually discovered his hat beside the tank.
Reports suggest that wooden boards were used instead of manhole covers to protect hazardous areas.
A reporter from the Guangzhou Daily saw the construction site and said at night it would have been difficult to see any gaps in the boards that were covering holes.
Local authorities are investigating the death.