German Continental Deep Drilling Programme

The German Continental Deep Drilling Program , abbreviated as the KTB borehole, was a scientific drilling project carried out from 1987 to 1995 near Windischeschenbach, Bavaria. The main super-deep borehole reached a depth of 9,101 meters in the Earth's continental crust.

The Federal Ministry of Research funded the project with 528 million DM . The Lower Saxony LBEG mining office took the project lead. After the drilling project ended, the German Research Centre for Geosciences used the borehole to install a seismic deep observatory which was active from 1996 to 2001. The derrick used at the site, one of the largest in the world, remains in place and has become a tourist attraction. The two boreholes were kept open for further scientific research and for in-situ testing of equipment and devices.

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