Suction pile (10) intended to sink into a seabed (50), said water-covered seabed (54) being, with water one at a hydrostatic pressure at the bottom, in the vicinity of said seabed (5 0 ), said suction pile (10) having a ndrica cili wall (12) and a movable piston (14) in the i nterior of said cylindrical wall (12) comprising, said cylindrical wall having a suction end open (24), adapted to sink into said seabed (5 0), delimiting it said pisto n (14) sealingly two chambers or placed, being susceptible of said chambers (20) extending between said suction end (24) and said piston ( 14), filled with water when said suction end (24) is disposed against the seabed (50), along said suction pile (10) comprising pumping means (56) for extracting the water contained in one of said chambers (20) and cause the collapse of said suction end (24) said seabed; characterized in that it comprises me god lock (28, 30, 32, 38, 40, 42, 44) of said piston (14) co n relative to said cylindrical wall (12), while said cylindrical wall has an inlet end water (26) opposite to said suction end (24) relative to said piston (14) to permit entry of water to the hydrostatic pressure to the other chamber (22); and that said piston (14) is blocked and sets in motion alternately from said suction end (24) to said inlet end of water (26) as said suction end (24) is sinking, so that said piston (14) is subject to hydrostatic pressure and causes the collapse of said suction end (24) in said seabed (50).
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