Shock absorber

A shock absorber for use in lowering a structure in a body of sea water to the bottom thereof, the shock absorber being completely submerged in the body of sea water during said lowering of the structure, the shock absorber comprising:

• a cylinder with a piston arranged slidably therein, said piston having a piston rod which in the use of the shock absorber extends downwards out of the cylinder, wherein at least one chamber in the cylinder above the piston is finable with a fluid and is provided with means for controlled exiting of the fluid from the chamber to the body of sea water when the piston rod is subjected to an impact force which presses the piston inwards in the chamber,
• wherein said fluid is water deliverable from the body of sea water to said chamber through a valve device having a one-way function in the piston, and
• wherein the piston and the piston rod alone have sufficient weight to pull the piston down and provide renewed filling of the chamber with water primarily through the valve device when the impact force has ceased and before a new pressing in of the piston rod is caused by heave movement of the structure.