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Discoveries in the Deep
A Chronology of Undersea Exploration

Pacific Ocean above Juan de Fuca Ridge Pacific Ocean above Juan de Fuca Ridge.
Sir John Ross lowers a line more than a mile into the North Atlantic and hauls up worms and a large sea star.

Edward Forbes proposes that no substantial life can exist below three hundred fathoms.

The first transatlantic telegraph cable comes to life, its laying preceded by deep seabed surveys.

Darwin's Origin of Species implies that the deep is a sanctuary for living fossils.

Norwegians haul up from the deep a sea lily, a living fossil previously found only in rocks 120 million years old.

Jules Verne's Twenty Thousand Leagues Under the Sea depicts no life in the ocean's deepest regions.

British ship Challenger sails the globe while lowering dredges and other gear into the deep, finding long mountain chains, puzzling nodules, and hundreds of animals previously unknown to science.

The 'Pompeii' tubeworm, Alvinella pompejana The 'Pompeii' tubeworm, Alvinella pompejana.

Prince Albert of Monaco starts to probe the sea's dark midwaters, discovering new kinds of eels, fish, and squid.

Alexander Behm sails the North Sea and bounces sound waves off its bottom, advancing a new method of depth measurement known as echo sounding.

Fritz Haber launches the German Meteor expedition in a bid to extract gold from seawater.

William Beebe and Otis Barton descend in a tethered sphere to a depth of a half mile, where they glimpse a previously unseen world of living lights and bizarre fish.

Fishermen off South Africa pull up an ungainly five-foot fish identified as a coelacanth, a living fossil thought extinct since the days of the dinosaurs.

Coelacanth, the 'fossil fish' Coelacanth, the 'fossil fish'.
Auguste Piccard dives in his bathyscaph, the first untethered craft that carried people into the deep.

Danish ship Galathea lowers dredges into the sea's deepest trenches and hauls up swarms of invertebrates.

British ship Challenger II bounces sound off the bottom, and near Guam finds what appears to be the sea's deepest chasm, its lowest point nearly seven miles down, subsequently named the Challenger Deep.

Marie Tharp, studying echo soundings, discovers that the Mid-Atlantic Ridge conceals a long rift valley, which turns out to be part of a hidden volcanic rent that girds the global deep.

Vent in the ocean floor Vent in the ocean floor.

Auguste Piccard and his son Jacques enter Trieste, an improved bathyscaph, and dive to a depth of nearly two miles.

American Navy buys Trieste and begins to strengthen its steel personnel sphere.

Jacques Piccard and Don Walsh dive in Trieste to bottom of Challenger Deep, seven miles down.

American ship off Mexico lowers a pipe through more than two miles of water and drills into the rocky seabed, a first that advances the fields of deep geology and mining.

Robert Dietz, studying echo soundings, proposes that the seabed's mountainous rifts are invisible scars where molten rock from the Earth's interior wells up periodically and spreads laterally to form new ocean crust, a process he calls seafloor spreading.

Lava mound on the East Pacific rise Lava mound on the East Pacific Rise.
Thresher, America's most advanced submarine, sinks in waters a mile and a half deep with the loss of 129 men.

Trieste finds the shattered hulk of Thresher on the bottom after five months of searching.

American Navy founds the Deep Submergence Systems Project to develop new gear that can better probe the deep sea's darkness. Navy launches submersible Alvin, the first piloted craft able to roam the deep with relative ease.

The submersible Alvin on duty The submersible Alvin on duty.

Navy tests its first underwater robot.

Navy develops Halibut, a submarine that can lower miles of cables bearing lights, cameras, and other gear to spy on enemy armaments and materiel lost on the bottom of the sea.

Alvin and Navy robot probe the deep Mediterranean and retrieve a lost American hydrogen bomb.

Halibut spies on Soviet warheads abandoned to the deep.

Continue: 1967

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