"Depth of the Deepest Drilling" hypertextbook.com... "Depth of the Deepest Drilling" http://hypertextbook.com/facts/2003/AdamCassino.shtml hypertextbook.com... hypertextbook.com/facts/2003/AdamCass... "Depth of the Deepest Drilling" Depth of the Deepest Drilling “Depth of the Deepest Drilling” "Depth of the Deepest Drilling" http://hypertextbook.com/facts/2003/AdamCassino.shtml A List of the World's Deepest Man-Made Holes Depth of the deepest drilling deepest drill hole on land hypertextbook.com... http://hypertextbook.com/facts/2003/AdamCassino.shtml