A man was decapitated in front of his partner as he was test-driving a hovercraft he had built at home.
The 40-year-old was operating the hovercraft for the first time when something went wrong with the engine, causing a blade to strike his head.
Sergeant Colin Nuttall, from the Waitemata police serious crash unit, said the man died instantly when the accident happened about midday on Sunday with his partner and a next-door neighbour looking on.
The man built the hovercraft at his west Auckland home from a kitset.
Mr Nuttall did not know where he bought it or if he had experience with hovercraft kitsets.