An inquiry has been launched into how a scaffolder working at Fawley Refinery fell 30ft through a roof.
The scaffolder, believed to be an employee of Middlesex-based Cape Plc, fell through the roof of a disused building, landing onto the concrete floor below.
The 33 year old was airlifted to Southampton General Hospital with serious injuries.
A refinery spokesman said the accident occurred last Saturday at about 8am.
She added: “He was treated at the scene and transferred to hospital by the Hampshire and Isle of Wight Air Ambulance.
“Hampshire Constabulary also attended the incident.
“The Health and Safety Executive has been informed and an investigation has been launched.
“Our thoughts are with our colleague and his family.”
A South Central Ambulance Service spokesman confirmed that the man, who has not been named, fell about 30ft.
He added: “We sent a rapid response vehicle, an ambulance, one of our officers, the fire service co-responder from Hythe and the air ambulance to the scene.
“The patient was a 33-year-old male who had fallen through the roof of a disused building on to a concrete floor.
“He had fallen from a height of around ten metres and landed on his left side, sustaining serious injuries to his left arm, left leg and pelvis.
“He was treated at the scene by the air ambulance team before being flown to Southampton General Hospital.”
Hampshire Police confirmed that officers received reports of a man falling from scaffolding at the refinery but said the investigation was being headed by the HSE.
A Cape Plc spokesman was unavailable for comment.