Abstract: A tether assembly (2) for a tethered buoyant platform for installation in a shaft (8) of a leg (10) of the tethered buoyant platform comproses a cable tether (4) having a terminal at one end for connecting to an anchor post (12) on the sea bed and having a bearing (16) which is a sliding fit in the shaft (8) of the leg (10) to transmit lateral forces from the tether to the shaft (8) of the platform. The assembly (2) further includes upper and lower bending guides (18 and 20) each providing a curved surface to control the bending radius of the tether (4) and a tether length adjuster (30) comprising a plurality of axially spaced apart members capable of engaging corresponding members associated with a releasable clamp (6).