Two climbers have been rescued from an altitude of 1800 metres in Aoraki/Mt Cook National Park.
One of them of badly injured.
The Marchtime Rescue Coordination Centre said the climbers were caught in a rock slide in steep terrain last night.
Search coordinator Neville Blackmore said the pair, a man and a woman in their 50s, activated the distress function on their GPS tracker, which may well have saved the injured climber's life.
The man suffered a broken arm, concussion and a gashed leg.
The other climber was relatively unharmed - she roped the injured party onto the slope.
Heavy cloud hampered the rescue until early Thursday morning, when a helicopter winched a rescue crew down to the pair. They arrived at Greymouth Hospital just before 9am.