[hacker234]

> There is a whole lot of pressure at greater depths. That by itself can bring the water up.

The pressure inside a deep pipe will be the same as that outside the pipe. Where will your differential pressure come from?

[stmfreak]

From evacuating the water at the top of the pipe.

[colordrops]

How does that differ from standard run-of-the-mill pumping?

Edit: ok, I get it, there's no suction, just removal of the water, and the pressure of the ocean pushes it back up to sea level.