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The boys were critically hurt when a sand dune collapsed and buried them on Great Barrier Island on Sunday.
The pair - including a teenager - were flown to Starship children’s hospital in critical condition from a beach on the island, Auckland Westpac Rescue Helicopter said.
“Our thoughts are with the boys and their families,” a rescue helicopter spokesman said.
Chairwoman of the Great Barrier Local Board Izzy Fordham earlier said that she was “very aware” of the incident and told the Herald it was a “horrid time”.
Great Barrier’s sand dunes extend across the eastern coast of the island, from Medlands to Whangapoua.
One Great Barrier Island resident said there were ocean-side sand dunes that were left exposed after the recent severe weather events, and locals were worried about them.