A teenage boy was airlifted to hospital with serious injuries on Sunday after falling from a rope swing on the Penrose Estate.
A spokesman for the South West Ambulance Service said the boy, thought to be aged 14 or 15, suffered “significant injuries” as a result of the incident on the estate between Helston and Porthleven.
Two ambulance crews and the air ambulance were called out just before 2.10pm and were helped by Helston’s firefighters in bringing the boy up a steep bank and to the helicopter.
He was transferred to Truro’s Royal Cornwall Hospital by 4pm.
Mike Hardy, National Trust head ranger at Penrose, said the trust had not been aware of the swing on its land and it had not been provided by them.
Occasionally rope swings were put up by people and often these would be taken down, only to be replaced.
Mr Hardy said: “Our thoughts and best wishes go to the lad and his family.”
He added that the National Trust rangers carried out a lot of work to make sure Penrose was a safe place for people to visit.
“It seems like a really nasty accident,” said Mr Hardy.