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PHOTO TIME LINE: SEA
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Photo: Close-up of a mural in an Egyptian tomb
Photo: Painting of a battle in the Persian war
Photo: Painting of Vikings at Vinland on Newfoundland
Photo: Painting of the Atlantic journey of Christopher Columbus
Photo: Portrait of Charles Darwin
Photo: The "Lulu," a floating geological laboratory at the Cayman Trench
Photo: Mineral chimney on the ocean floor
Photo: Titanic bow
Photo: The "Lulu," a floating geological laboratory at the Cayman Trench
1951: Discovery of the Mariana Trench

In 1951, while surveying the seafloor near the Marianas Islands in the Pacific Ocean, the British ship Challenger II discovers the Mariana Trench, the deepest sea trench on Earth. Its bottommost part, called Challenger Deep, is 6.9 miles (11 kilometers) below the surface. In 1960 the bathyscaphe Trieste dives to the bottom of Challenger Deep.

Photograph by Emory Kristof

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Learn More About Exploration
Title: Sea Photo: A ship sailing past an island
How deep is the deepest part of the ocean? What was Sir Francis Drake's claim to fame? Test your ocean exploration IQ in this online quiz.
Quiz: Sea

Title: Land Photo: Ancient Chinese Compass
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Find out when the first compass was invented. See the highlights of human land exploration in this photo time line.
Quiz: LandTime Line: Land
Title: Air Photo: Breitling Orbiter III balloon
Who was the first person to break the sound barrier? Test your knowledge with the online quiz. Travel back in time to see the major milestones in air exploration in the photo time line.
Quiz: Air Time Line: Air

 
 
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Photo: Philips Norelco arcitec razor
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