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Commercial divers in Newcastle were preparing to enter the water on Tuesday when a large shark swam under their boat, as captured in Dustin Besse's video.

Beaches on the NSW north coast have been closed for the third day in a row after a fatal attack by a great white shark on Monday and subsequent shark sightings close to swimming spots.

Aerial patrols spotted two sharks late on Wednesday afternoon - a four-metre shark near Flat Rock and a three-metre shark near Ballina Bar.

All beaches between South Ballina and Lennox Head remain closed and their safety reassessed on Thursday.

Read more from the original source:

North coast beaches closed after further shark sightings near Ballina