Close to 50 long-finned pilot whales are stranded on a remote beach at the top of the South Island.
The Department of Conservation (DoC) was first alerted to the mass stranding at the base of Farewell Spit in Golden Bay by a tour operator at 9.30 today.
A spokesperson said nine of the 49 whales have died.
DoC is aiming to refloat the whales once the water is deep enough and rangers are on site to assist them. High tide is about 7pm.
"Project Jonah marine mammal medics will assist with refloating the whales and caring for them on the beach, keeping them cool and wet until they can be refloated," DoC said.