^
Night before Wasa was lifted 1960's finnish university of technology students dived down to the wreck and seated Paavo Nurmi-statue on the deck.
wiki:
Many of the more recent objects contaminating the site were disregarded when the finds were registered, but some were the remains of the 1660s salvage efforts and others had their own stories to tell. Among the best known of these was a statue of 20th-century Finnish runner Paavo Nurmi, which was placed on the ship as a prank by students of Helsinki University of Technology (now known as Aalto University) the night before the final lift.[58][59] The inspiration for the prank was that Sweden had forbidden Nurmi from competing in the 1932 Summer Olympics in Los Angeles, United States.
Friend of mine dives wrecks and is registered sea archaeologist (they don't do treasure hunt but search wrecks) and he said that when ship sinks it sinks moving in 45 degree angle so it can be really far away from the actual sinking spot before hitting sea bed. And you can't tell which direction it sinks. So, one km depth leaves two km circle to start search with.
No wonder it took time before largest WW2 wrecks and Titanic were found.
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