A mystery yacht found on the sea floor of the Picton Harbour could be the Sioux - an uninsured $150,000 vessel which went missing five years ago.
Police said the wreck was about 10m long and had been found near the entrance to the harbour on Friday during a Defence Force training exercise.
Acting area commander Senior Sergeant Peter Payne said it fit with the disappearance of the Sioux, a 10m vessel which broke free from its mooring in Waikawa Bay during stormy weather in June 2010.
Shortly after the vessel's disappearance, yacht rigging was reported in the water near where the wreck has been found, but police were unable to locate the rigging at the time.
Police divers would investigate the wreck and confirm the identity of the vessel as soon as arrangements were made, Mr Payne said.