The City of Edmonton has shut down all tunnelling operations after one of its employees was killed on the job.
Emergency crews were called to a sewer line site in a southwest neighbourhood Tuesday afternoon.
The name of the 44-year-old man has not been released.
Alberta Occupational, Health and Safety is investigating.
City manager Linda Cochrane says until they found out why the man was killed, all city tunneling operations have been suspended.
The project runs 20 metres deep and when complete will be 155 metres long and crews were about a quarter of the way through it.