Chief inspector Steve Kelly said any employer carrying out work in this kind of environment should be well aware of the risks.
"I ask employers and workers to consider the long term impact of losing three fingers. This worker has suffered injuries that will affect him for the rest of his life."
"Preventing workers from sustaining serious injury relies on making a risk assessment and
ensuring there are appropriate safety controls and emergency procedures in place.
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The April 2018 incident occurred as the employee was left to work alone in the manhole, which was at another site.
"This incident also highlights the importance of consulting, cooperating and coordinating with other businesses involved on a job."
The company was fined $229,921 for the accident.
Canterbury Concrete Cutting NZ Limited must also pay $23,400 in reparations for failing to appropriately manage risk and identify safe work methods and controls in the workplace.