Deepest Hole Ever Drilled?

Someone in one of my classes asked today what was the deepest human's have ever drilled into the Earth's crust, and the answer I can find online is 12,261 m.  The Russians in the 1970's built a drill called the Kola Superdeep Borehole, with the intent to sample the region between the crust and the mantle, called the "Moho" short for the Mohorovičić discontinuity. They never made it to their goal, but the project has given scientists and geologists and immense amount of information about the Earth's crust, as well as giving new information, changing what we thought we knew before about the structure of the crust.  

A few links, if you are interested:

International Scientific Continental Drilling Program

Wikipedia-Kola Superdeep Borehole

Another drilling project through a thin area of the earth's crust:

Integrated Ocean Drilling Program