Others discover new hobbies, scaling mountaintops, exploring the sea bottom, and the depths of the jungle.
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 involves learning where sponges grow, picking the right one, prying an intact sponge from the sea bottom, and using it on their noses to root around the right areas to find fish concealed in the sand.
Dredging: excavation, digging, scraping, draglining, suction dredging to emove sand, silt, rock or other underwater sea-bottom material.
Shrewdly, Ballard made sure his sea-bottom itinerary took him close to where the Titanic was thought to lie.
Deep water: area where surface waves are not influenced by the sea-bottom.
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.
Seagrass bed: area of the offshore sea-bottom colonized by seagrasses.
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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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.
One and all, they were harpooned and dragged up hither from the bottom of the sea.
Russians and Americans playing chess peaceably, seemingly and inexplicably at 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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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 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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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.
Riding the dark ocean in the pitch of night before all hell breaks loose, sending up a cloud of heavy black rain and fire, throwing heavy equipment into the icy water, casting men to their deaths at the bottom of the sea.
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.
If all goes as planned, the next time you travel to Spain you can gaze on treasures that were not intended for you to see booty, in fact, that was headed to the hands of treasure hunters and other adventurers, as so often happens with valuables rescued from ships lying at the bottom of the sea.
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.
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.
That will raise the sea level, increasing the pressure at the bottom and thus stabilising clathrates there in other words, there will be negative feedback.
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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Where once it had recycled mountain rain into a vast aquifer underneath, its hard bottom now ushers occasional floodwater right out to sea.
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