A 40-year-old man who was pinned under a tree in Marlborough this morning had been tutoring forestry students at the time.
The Blenheim man had been part of a group felling trees in the Waihopai Valley, near Blenheim, when the incident happened about 11.30am, Nelson Marlborough Rescue Helicopter chief crewman Paul Bryant said.
"They were felling big pine trees and during the process of one of them being felled, he ended up being trapped underneath it."
Police said the man had been tutoring forestry students from the North Island at the time. No one else was injured in the incident.
Mr Bryant said the man suffered serious chest and leg injuries.