Cassette assembly, waterborne vessel and method of servicing a water-accessible structure

A cassette assembly 200 is attachable to an end portion (102, Fig 1) of a waterborne vessel (100, Fig 1). The cassette assembly includes a cassette section 210 to bear against an external structure (300, Fig 5A) in use. The cassette section is movable relative to the vessel in a direction towards an opposite end of the vessel. A resilient buffer system 250 counters movement of the cassette section when the vessel is moved towards the external structure, wherein the resilient buffer system includes a buffer 251 including a plurality of resiliently compressible elements 253 arranged in series. A waterborne vessel includes a receiving portion (120, Fig 2) for receiving the cassette assembly and can be used to service a water-accessible structure such as a wind turbine.