Chikyū

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Chikyū (ちきゅう) is a Japanese scientific drilling ship built for the Integrated Ocean Drilling Program (IODP). The vessel is designed to ultimately drill 7 km (4.3 miles) beneath the seabed, where the Earth's crust is much thinner, and into the Earth's mantle, deeper than any other hole drilled in the ocean thus far. While the planned depth of the hole is significantly less than the Russian Kola Superdeep Borehole (which reached 12 km or 7.5 miles depth on land), the scientific results are expected to be much more interesting since the regions targeted by Chikyū include some of the most seismically active regions of the world. Other deep holes have been drilled by the drill ship JOIDES Resolution during the Deep Sea Drilling Project and the Ocean Drilling Program.