A contractor has claimed his company drilled up to 200 holes into concrete beams and floors of the CTV building.
Daniel Morris was a company director of Christchurch firm Knock Out Concrete Cutters, which was commissioned to do the work in the late 1990s to install cabling and plumbing.
The contractor's giving evidence at today's Royal Commission hearing into why the building collapsed in last year's February earthquake, claiming 115 lives.
Mr Morris says while he can't remember exactly how many holes they drilled, the work was extensive.
"They were all over the place. My best estimate is that we would have drilled about 200 holes in the CTV building, about 50 of those would have been through the beams."
Mr Morris could not recall who commissioned the work and has no records of it.
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