Researchers have drilled the deepest-ever sample of rocks from Earth's mantle ... Previous efforts to drill into mantle rocks brought to the surface in the deep sea had reached only 659 feet ...

There is Japan’s Chiky with a maximum drilling depth of 7 kilometers (4.3 miles) and there was the US-owned JOIDES Resolution with ... thinness to gather samples of Earth’s mantle, although ...

Markku Oinonen is drilling a sample containing interesting information on events in the 19th century. (Photo: Joonas Uusitalo) ...