Two Australian warships, the HMAS Melbourne and the HMAS Voyager, collided off the New South Wales coast.
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A 400-year-old shipwreck was discovered just 15 miles off the coast of Portugal.
The cruise ship Costa Concordia sinks, killing 32.
'Victoria' became the world's first recorded ship to have circumnavigated the globe when it arrived back in Spain.
A US submarine collided with a Japanese high-school fishing training ship off the coast of Hawaii.
The Danube-Black Sea Canal was opened.
