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"If you had a whole bunch of paid contractors standing around waiting to do work it would be bigger."
He said they would still aim to get it open in February, keeping busy with other jobs that needed doing while the digger was being fixed.
Canoe Polo Hawke's Bay chairperson Kelly Hepburn said it was incredibly disappointing.
"Everyone has put in so much time and effort. One little thing like this is a massive, massive set-back.
"But you know what, we'll get there ... we'll bounce back."
Hastings Mayor Sandra Hazlehurst said she was devastated to hear of what she described as significant vandalism.
"The contractors have been working 15 hour days to complete this project in time for opening in February.
"It's extremely sad that this type of needless antisocial behaviour will have a negative impact on so many by slowing down progress."
She wanted to acknowledge all the people who had put time and effort into building the facility.
Hazlehurst said the Hastings District Council would look at options to support the ongoing development of the facility with security measures.
The facility will include four canoe polo courts, and can be used for other small boats and swimming activities.
Construction began in November this year, although Hepburn said it had been eight or nine years in the making.
A police spokesperson confirmed they received a complaint about a damaged excavator being broken into at the sports park.
"Police have conducted forensic examination and are currently awaiting results."