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"We went through the tunnel quickly. We didn't stay around and look inside," he said.
The road, he said, was "pretty buggered". In one area they came across a section of railway track attached to the sleepers that had jumped up and moved toward the hill without taking any gravel with it.
"It is probably going to have to be re-engineered. It will be a huge, huge job," Wilding said.
They also encountered a part of the seabed that had been lifted above the low tide mark with paua, crayfish and dead fish in the open.
At Oaro, Wilding said they saw two massive slips either side of a house that survived the earthquake.