The Auckland council company that's admitted it failed to protect its staff says a deadly blast two years ago was because of human errors.
The gas explosion in Onehunga in June 2011 killed Watercare engineer Philomen Gulland and seriously injured others.
A summary of facts from the ministry prosecuting Watercare has been read in court for the first time.
The Ministry of Business, Innovation and Employment's laywer Shona Carr says the workers didn't follow Watercare's procedures before the blast.
It also says Watercare didn't tell contractors that gas had been found in the area before.
Watercare's lawyer John Billington says the explosion was caused by a set of human errors and not systemic faults.
The company entered guilty pleas on Monday.