A team of marine archeologists using sonar scanners have discovered four ancient shipwrecks off the tiny Italian island of Zannone, with intact cargoes. The remains of the trading vessels, dating from the first century BC to the 5th-7th century AD, are up to 165 meters underwater, a depth that preserved them from being disturbed by fishermen over the centuries. “The deeper you go, the more likely you are to find complete wrecks,” said Annalisa Zarattini, an official from the archeological services section of the Italian culture ministry. The timber structures of the vessels have been eaten away by tiny marine organisms, leaving their outlines and the cargoes still lying in the position they were stowed on board. The vessels, up to 18 meters long, had been carrying cargo from North Africa and Spain including olive oil, fruit and garum, a pungent fish sauce that was a favourite ingredient in Roman cooking. Another ship, as yet undated, appeared to have been carrying building bricks. It is unclear how the vessels sank and no human remains have been found. Italy has signed a new UNESCO agreement that requires them to leave the wreckage in place, potentially opening the way to would-be treasure hunters although Zarattini said the benefits in terms of tourism outweighed the risks.