Abstract: The invention relates to a device for removing the growth on a ship's hull (2). This device comprises a cleaning element (3) and means for displacing this cleaning element over the hull (2), which means comprise at least one cable (4) which is arranged such that it passes underneath the keel of the hull (2) and to which the cleaning element (3) and means (5) for moving the cable (4) are connected. The cleaning element comprises at least one mat (3) comprising a flat base (13) consisting of an elastically deformable material, which at least at one side, is provided with a relief (14) of wear-and-tear-resistant, elastically deformable material. In the mat (3) at least one magnet (17) is provided.

Abstract: The invention relates to a device for removing the growth on a ship's hull (2). This device comprises a cleaning element (3) and means for displacing this cleaning element over the hull (2), which means comprise at least one cable (4) which is arranged such that it passes underneath the keel of the hull (2) and to which the cleaning element (3) and means (5) for moving the cable (4) are connected. The cleaning element comprises at least one mat (3) comprising a flat base (13) consisting of an elastically deformable material, which at least at one side, is provided with a relief (14) of wear-and-tear-resistant, elastically deformable material. In the mat (3) at least one magnet (17) is provided.

Abstract: The invention relates to a method for protecting an underwater surface (3) against pollution due to fouling, in particular a metal surface, upon which a coating (4) is applied, whereby the coating (4), in the presence of water, is brushed or polished smooth with at least one brush (8) having brushes (9) made of synthetic material in which a grinding agent (10) is embedded. In the coating (4), glass flakes (5) are embedded to which silver is bonded.

Abstract: The invention relates to a method for protecting an underwater surface (3) against pollution due to fouling, in particular a metal surface, upon which a coating (4) is applied, whereby the coating (4), in the presence of water, is brushed or polished smooth with at least one brush (8) having brushes (9) made of synthetic material in which a grinding agent (10) is embedded. In the coating (4), glass flakes (5) are embedded to which silver is bonded.

Abstract: Method for carrying out operations under water by means of a crane (3) equipped with a tool which is erected on a pontoon (1) which has been fixed and which can be jacked up, wherein an underwater working room (4) which is mainly open at the bottom is let down on the place of work, in that the water is pushed out of this working room (4) by means of compressed air, in that the place of work is divided in compartments in the working room (4) itself, i.e. out of the water, and in that one or several positions of the compartment division in which the crane (3) will have to carry out an operation are transmitted to the crane (3), after which the underwater working room (4) is lifted and the crane carries (3) out the operation.