Hopes are fading to find two missing men off the coast of the Eyre Peninsula.
Tony Higgins and Derek Robinson were first reported missing on Sunday, with a major aerial search for the pair kicking off.
The duo were last heard from last Friday night when they called a friend.
At that point, the men reported that they were having trouble with their boat’s propeller.
The men’s last known location was between Coffin Bay and Kangaroo Island, the men were attempting to sail their 33ft fishing boat from Coffin Bay to Goolwa.
Police say that they 104,000 square kilometres have so far been covered in a wide-reaching search.
Anyone who spots the missing vessel with registration RF83S is being urged to contact contact police immediately on 131 444.