Wreck of the Swedish warship Mars, which exploded during the first battle of Öland. Pretty well preserved for 500 years underwater (Baltic Sea)

It was the largest and fiercest warship in the world, named the Mars for the Roman god of war, but it went up in a ball of flames in a brutal naval battle in 1564, consigning 800 to 900 Swedish and German sailors and a fortune in gold and silver coins to the bottom of the Baltic Sea.

Now, a few years after the ship’s discovery, researchers have concluded that the one-of-a-kind ship is also the best preserved ship of its kind, representing the first generation of Europe’s big, three-masted warships.