Abstract: A new pile assembly is disclosed. It comprises an open end pipe pile (a cylindrical pipe pile provided with a pile cap) that is provided with: (1) a diaphragm adapted to slide axially within said open end pipe pile; (2) a conduit that allows gases and liquids to flow to and from the upper portion of the interior of said open end pipe pile through a conduit port; and (3) a one-way valve that allows gases and liquids to flow from an inlet port (that is below said conduit port) in the interior of said open end pipe pile to an exhaust port on the exterior of said open end pipe pile. The preferred embodiment of the invention also comprises: (4) an open end pipe pile with a lower end of reduced interior diameter; (5) means for retaining drilling mud in the lower portion of said open end pipe pile; and (6) a flexible riser in the interior of said open end pipe pile that provides a passageway for liquids and gases from said inlet port to said one-way valve.