What is the deepest any man made object has been to the center of the earth?

I would assume it was a deep sea drill. Also how far would you have to go to get to the dead center of the earth with a drill ( I know it is totally impossible )What is the deepest any man made object has been to the center of the earth?
The deepest well drilled in the world is the Exxon-led Sakhalin-1 at 37,016 feet. The deepest ocean trench is the Marianas Trench at 35,840 feet. The depth to the core of the earth varies from about 3,949 miles to 3,963 miles.What is the deepest any man made object has been to the center of the earth?
the following was taken from Wikipedia:





http://en.wikipedia.org/wiki/Project_Moh…





Project Mohole was an ambitious attempt to drill through the Earth's crust into the Mohorovičić discontinuity, and to provide an Earth science complement to the high profile Space Race. It was led by the American Miscellaneous Society with funding from the National Science Foundation. Phase One was executed in spring 1961. Off the coast of Guadalupe, Mexico, five holes were drilled, the deepest at 183 m (601 ft) below the sea floor in 3,500 m (11,700 ft) of water. This was unprecedented: not in the hole's depth but because of the depth of the ocean and because it was drilled from an untethered platform. Also, the core sample proved quite valuable, showing Miocene age sediments with the lowest 13 m (44 ft) comprised of basalt.





Project Mohole contracted with Global Marine of Los Angeles for the use of its oil drillship called CUSS I. A consortia of Continental, Union, Superior and Shell Oil Companies (CUSS) had originally developed it in 1956 as a technological test bed for the nascent offshore oil industry. While ';CUSS I'; was one of the first vessels in the world capable of drilling in water depth up to 600 ft, Project Mohole expanded its operational range by virtually inventing what is now known as dynamic positioning.





Phase One proved that both the technology and expertise were available to drill into the Earth's mantle. However, Mohole--Phase Two was dissolved in 1966 due to poor management and cost overruns.





Japan now has a new project with the same goal, Chikyu Hakken.





http://en.wikipedia.org/wiki/Chikyu_Hakk…





Chikyu Hakken (地球発見, Chikyū Hakken?), Japanese for ';Earth Discovery';, is a mission primarily led by the Japan Agency for Marine-Earth Science and Technology, or JAMSTEC. The half-billion dollar plus project aims to be the first to drill seven kilometers beneath the seabed and into the Earth's mantle; three times deeper than ever drilled before.
Anything dropped in the Marianas Trench. Right down 11km.





The Earth's radius is about 6,356.750 km — 6,378.135 km (≈3,949.901 — 3,963.189 mi),
im not 100% but i think its the lithosphere
deep sea drilling has only been as far as 10 miles down but can drill up to 50 miles horizontaly the pressures involved in making a hole deeper than this is to risky geophyics has determind that the earths crust is 25 miles thick then its magnma thats liquid rock centre is approx 2000 miles
Now we still can't get to the dead center of the earth with our modern teknologi. The deepest man-made hole I%26lt;span lang=';en-us';%26gt;'%26lt;/span%26gt;m aware of is in the Kola peninsula in Russia. It%26lt;span lang=';en-us';%26gt;'%26lt;/span%26gt;s about 12 km deep, nowhere near reaching mantle. Some holes are being dug in the ocean [3], where the crust is thin, and sometimes they find chunks of mantle in those holes. Volcanoes sometimes spew up chunks of mantle as well, so we do have samples of (upper) mantle to study in the laboratory.





I found it in this website.