It must be buried under a mountain, sunk to the bottom of the sea, or placed under a thick layer of salt deep under a desert for instance.
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The oldest is the HMS Victory, which sank in a storm in 1744, and went to the bottom of the sea with as much as 100, 000 ounces of gold.
Among the new measures proposed are the phasing out of bottom trawls, the heavy gear that scrapes material from the bottom of the sea - fish, coral and anything else in its way.
One and all, they were harpooned and dragged up hither from the bottom of the sea.
Did Iceland slip below the North Atlantic waves, joining the Titanic on the chilly, dark bottom of the sea?
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Whichever comes out on top, though, it is clear that astronomers believe there is treasure to be found at the bottom of the sea.
Jeff Bezos, the founder and CEO of Amazon.com, is responsible for this voyage to the bottom of the sea, which recovered two huge F-1 engines.
He earned plaudits from another well-known adventurer: Richard Branson, who on Monday pledged to work alongside the filmmaker to map the undiscovered bottom of the sea.
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The BP Oil Spill was unique in that it was a man-made disaster, played out in slow motion over months and televised from the bottom of the sea.
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Unfortunately two of the tags were lost - they skimmed on the water just before they hit the walruses, sinking to the bottom of the sea, but another one, launched by Ole with the harpoon, hit a walrus squarely between the shoulders - the perfect place for a sat-tag.
Until it is known whether or not there was an explosion on board, or whether the vessel hit something, the Russian press remains bewildered as to why the flagship of the Northern Fleet is lying on the bottom of the Barents Sea, with 116 crew members on board.
Proponents point out that some areas of sea bottom are devoid of anything special and can stand it.
Over the centuries, millions of ships sank to the sea bottom, priceless treasures and chests of coins with them.
The research, carried out after several years of surveying sea bottom and trial trenching, was devoted to set up a fixed network, to document the site and to excavate the shipwreck.
It would be like risking the vinous equivalent of the bends, the decompression sickness of deep-sea divers who ascend too quickly from the bottom of the ocean.
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Seagrass bed: area of the offshore sea-bottom colonized by seagrasses.
Criticism of the disaster has sprung in part from decisions made over the design of the BP well, which used a single pipe, known as a "long string", that ran from the sea floor to the bottom of the well.
Others discover new hobbies, scaling mountaintops, exploring the sea bottom, and the depths of the jungle.
In a sense, but only if we cling to a linear scale of intelligence that places sea sponges at the bottom and humans at the top.
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This was quite easy, because the sand at the bottom of the hole was very soft and fine and dry, like sea-sand.
The road dips a precipitous path along the ridge from where the deep geological gash of the Great Rift Valley cascades downwards to meet its bottom at the Dead Sea, 400m below sea level.
Bar: fully or partially submerged mound of sand, gravel or other unconsolidated material built on the sea-bottom in shallow water by waves and currents.
Bottom-trawling's knock-on impacts are best illustrated by the plight of the deep-sea fish, the orange roughy (also known as slimeheads) whose populations have been reduced by more than 90%, according to marine scientists.
Year-round, travellers are guaranteed sightings of loud sea lions, shy harbour seals, diving brown pelicans, hundreds of other birds, and the bottom feeding leopard shark.
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