The police dive squad has been called in to help in the search for two boaties missing since Thursday.

Authorities are today continuing a search for the men who were on board the commercial fishing boat Wendy J when it ran aground near Smoothwater Bay, on the West Coast, four day ago.

The Wendy J is based in Greymouth.

A statement put out by police about 2pm said today's search effort was being conducted by helicopter, but that the police national dive squad had been called in.

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"The Police National Dive Squad are en route to assist with the search and are expected to arrive in Haast tonight."

A light aircraft in the area of Jackson Bay raised the alarm late on Saturday morning after spotting a life raft and debris on the shore.

A survivor, Mark Thomas, was later found safe and well.