The U.S.-sponsored drilling vessel was operated throughout the Ocean Drilling Program and the first phase of IODP. The vessel then underwent a rebuild, allowing for increased laboratory space; improved drilling, coring, and sampling capacity; and enhanced health, safety, and environmental protection systems on board.

Chikyu - riser-equipped

Japan began building a state-of-the-art scientific drilling vessel for research in 2001 with the intent of reaching Earth's mantle and drilling into an active seismogenic zone. The resulting

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