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He said it was an horrific and emotional scene.
Locals had put out word of the stranding the day before, he said.
"I mean the Chatham Islands ... is a pretty remote place, their beaches are pretty remote, there's not a lot of people around them so when they were eventually found the radio call went out to a few people, cause there's so many divers around the island, myself included."
Wild said the diving community is told to stay out of the water when there has been a whale stranding because the Chatham Islands has a population of great white sharks which may come in to feed on the carcasses.
"So stayed out of the water and took the camera instead and yeah it was pretty sad to see."
Wild said the Department of Conservation had been to the area the previous day to gather data and to euthanise some of the whales.
Whale strandings happen every year or two on the islands, he said.
The Department of Conservation has been asked for comment.
DOC's website describes the Chatham Islands as a mass stranding "hotspot" for pilot whales, adding that the biggest recorded pilot whale stranding was when an estimated 1000 whales stranded in the Chatham Islands in 1918.