The 65-year-old man who died following an industrial accident near the Homer Tunnel in Fiordland this afternoon was clearing a slip at the time, police say.
At about 12.50pm a worker for a contract company was killed while clearing a slip near Monkey Creek on the Milford Road, Te Anau Police Sergeant Tod Hollebon said.
The man sustained a "very serious head injury" following an incident with a compressed air hose, Southern ambulance spokeswoman Alena Lynch said.
He was treated at the scene by St John paramedics who had flown to his aid in a rescue helicopter from Te Anau, she said.
Despite the best efforts of all those on site, he was unable to be revived, Mr Hollebon said.