Disclosed is a system for the temporary holding, during pile driving operations, of a foundation pile intended to receive the mast of an offshore wind turbine. The temporary holding system includes a sleeve intended to receive a section of the foundation pile and a support frame intended to be secured to a floating device. The support frame includes a slide and an actuator, arranged to generate displacements of the sleeve according to the two translational degrees of freedom. The slide includes at least one rolling element including a cylindrical roller.

In summary, there is provided apparatus (1) for limiting transmission of sound from a sound emitter (2), the apparatus comprising a container (4) arranged to at least partially surround a sound emitter, the container retaining a liquid, wherein the liquid comprises at least 2% dissolved oxygen, and wherein the apparatus further comprises an agitator (6) configured to agitate the liquid, to thereby cause the formation of gas bubbles (8) in the liquid.