Internal pile cutter

An assembly to cut a hollow piling, comprising:

• a pressurized hydraulic fluid supply configured to supply enough force to force blades through up to the circumference of a piling;
• a housing having a cavity to receive the hydraulic fluid, the housing having five cylinder walls;
• five piston assemblies slidably disposed within the five cylinder walls configured to extend from the five cylinder walls in response to an introduction of pressurized hydraulic fluid into the housing cavity;
• a blade attached at a radially distal end of each of the five piston assemblies, whereby as the blade extends, a cutting force is applied to an encountered piling wall;
• wherein each blade has a blade edge;
• wherein the blade is attached at an angle to allow overlapping with adjacent blades;
• wherein the blade edge of each blade is configured to be adjacent to the blade edge of the adjacent blade;
• wherein the housing has spacers that extend to a diameter equal to or beyond a blade tip diameter in its retracted position;
• and
• wherein the blade has a piercing point.