What is the deepest you could dig a hole and not hit water

Question

What is the deepest you could dig a hole and not hit water

Answer 1

In order to know how deep you must dig to reach water, you have to understand the water table.  The water table is the highest point of ground water in an area.  The water table is very variable, changing in different areas and at different times of year.

See: http://en.wikipedia.org/wiki/Water_table

Answer 2

This will depend on the type of rock through which you are digging.  Any place with sedimentary rocks (even the driest deserts) have water in them.  Rocks that tend to have the least probability of water in them are unfractured intrusive igneous rocks, such as some types of granite.  It's theoretically possible that you could find such rock and dig all the way through the crust without hitting water.  There is a lower limit to digging, however, where the further through the crust you dig, the hotter the rocks will become and you will reach a point where either (1) your digging tools will get softer than the rocks and stop working and/or will melt, or (2) the extreme pressure on the rocks will close up the hole,  This depth varies depending on the characteristics of the crust at that location.

Answer 3

it really depends on where you are, and the water table in that area.

I imagine you could dig for a very long time in the Atacama Desert and not hit water.