The search for the wreck of the General Grant and its gold is regarded by many as the Everest of bounty hunting.
Ken Scadden's been fascinated by the wreck of the General Grant for decades, and he's has just co-authored a book about it - and the attempts to find and recover the gold.
He's worked closely with Bill Day who's tried four times to find the wreck on the Auckland Islands, 465 kilometres south of New Zealand.
The ship foundered and sank when it run aground on the Auckland Islands.
The year was 1866 and it was sailing to England with 2000 ounces of gold mined out of Australia.
It had 83 people on board when it sank in a cave beneath a sheer cliff face.
The survivors spent 18 months of harsh living, hand to mouth, before they were rescued.
The search for gold started almost immediately, three lots of survivors went back to look for it.
Since then twenty expeditions have been mounted and not one has found a piece of the wreck let alone any gold.
Bill Day thought he had struck it rich on an expedition in 1996.
He found the wreck of a ship in a cave in an area where the General Grant could have sunk.
What convinced them it was the General Grant was the dates on the gold and silver coins they found.
The oldest was dated 1834 and they would have expected coins from much later dates to be on the General Grant as it sank 32 years later.
But Bill Day is not giving up, he's mounting another expedition next year, and this time he'll be armed with some cutting edge technology, a giant metal detector called a magometer that can cut through the island's own magnetic field so they won't get any false readings.
No guarantees it will bring home the gold but once your’re committed to the hunt for lost gold it's hard to break its spell.
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