Rescuers used a crow bar to prize a boulder off a tramper yesterday morning, one of two unusual call outs for the NZCC Rescue Helicopter.
All patients rescued yesterday were the same age.
Pilot Martin Shaw, said the 66-year-old Christchurch man was doing the three passes walk in Harman Pass, near Arthur's Pass, when a one-tonne boulder moved, trapping him by the leg.
Mountain radio, then someone else's locator beacon, was used to alert rescuers.
As he was trapped in a gully, Mr Shaw hovered close by dropping off a paramedic and policeman, plus the crowbar and equipment picked up from Arthur's Pass search and rescue.