A Whanganui man who was filling oxygen tanks in a shed behind his house received burns to his arm when a hose burst, starting a fire.
Multiple calls were made to Fire and Emergency NZ when the Mason Tce shed went up in flames at about 10.30am on Saturday.
Explosions were also heard as gas tanks exploded.
The man's father said he was filling an oxygen tank in a shed when a hose burst and shot out onto the compressor and started the fire.
The shed was full of diving gear and wetsuits. When firefighters arrived, it was fully involved.