1. A free fall earth extracting apparatus for extruding earth from the ocean bottom comprising: a barrel having opposite open ends and being descendable to vertically penetrate the ocean bottom, an extrusion piston adapted to frictionally slide within the barrel, a container attached to the piston, an inflatable bag-like member connected at one end to the container, and means arranged within the bag-like member, thereby creating a positive buoyant force sufficient to lift the piston in the barrel, so as to effectuate extrusion of earth into the barrel, and then the apparatus including the extruded earth from the ocean bottom.

5. A free fall earth extracting apparatus for extruding earth from the ocean bottom comprising: a generally elongated tubular member having opposite open ends and being descendable to vertically penetrate the ocean bottom; means disposed within and frictionally engaging said tubular member for vertical movement relative thereto; expansible means connected with said means disposed within and frictionally engaging said tubular member; and means operatively associated with said expansible means to gradually inflate said expansible means, thereby creating a gradually increasing positive buoyant force sufficient to initially vertically lift said means disposed within and frictionally engaging said tubular member so as to effectuate extrusion of earth into said tubular member and then lifting the entire apparatus including extruded earth from the ocean bottom.

6. A method for extracting and retrieving earth from the bottom of a body of water using a free fall earth extracting apparatus having a barrel with opposite open ends and being descendable to vertically peneTrate the ocean bottom, an extrusion piston disposed within and slidable relative to the barrel, an inflatable bag-like member connected to the extrusion piston, and means for inflating said bag-like member and being connected to the bag-like member comprising the steps of: maintaining the extrusion piston adjacent one end of the barrel by frictional forces sufficient to permit the piston and the barrel to penetrate into the earth, below the body of water; dropping the apparatus into the body of water so that the end thereof with the piston is to be the end that penetrates the earth below the body of water; penetrating the earth below the body of water by downwardly directed gravitational forces on the apparatus including the piston; and exerting a positive buoyant force on the piston sufficient to overcome the frictional forces between the barrel and the piston to effectuate an upward lifting vertical movement of the piston relative to the barrel so as to effect extrusion of the earth within the barrel and then lifting the entire apparatus from the earth to the surface of the body of water.