Now the chance discovery is being hailed as one of the great undersea treasure discoveries of modern times.
Officials at the National Maritime Museumin Seoul say the pottery dates back to 12th century, when the Koryo Dynasty ruled the Korean peninsula.

Some of the 30 bowls from the 12th century discovered by the octopus

Before and after: The bowls are carefully restored to their former glory after nine centuries underwater,

'Before I set off in my boat I had a dream the night before of being in the water swimming,' he said. 'Such dreams are supposed to bring luck, so this one turned out to be true.'