A search and rescue team flown in to investigate a mysterious “HELP” message written into the sand of an isolated South Island lake found nothing of significance police say. 

A passing helicopter spotted the message yesterday, written into the sand on the bank of Lake Ahaura on the West Coast, east of Greymouth. 

Police said they were concerned by the sign and asked for the public to notify them about anyone who may have ventured into the area recently. 

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This morning police sent in a search team, who flew to the site by helicopter just after 9am. 

“They are going to have a look around the sign area to see if they can find anything else of interest,” a police spokeswoman said. 

On Saturday afternoon a police spokeswoman said the team had conducted a search of the area and found nothing of significance. 

“Additionally, no information has been received that would suggest anyone is in immediate danger. 

“The search team will now stand down, pending any new information received.” 

Lake Ahaura is at least 58 kilometres from Greymouth and about 8km from the reclusive Gloriavale Christian Community in Haupiri, the nearest settlement. 

• Mysterious ‘help’ message written on sand of Lake Ahaura: West Coast police investigate

A passing helicopter spotted this 'help' message written in the sand next to Lake Ahaura, on the West Coast, eliciting concern from police. Photo / Supplied 

The lake is surrounded by dense bush and mountains.

Police said yesterday they would “like to hear from anyone who may have written the message”.

“If you can help, please call 105 and quote event number P055875858,” a spokeswoman said.

Photographs of the message show other letters written in the sand which are hard to discern.