An access apparatus (2) for enabling transfer of personnel between an offshore vessel (4) and an installation (6) moving relative to the vessel is disclosed. The apparatus comprises a platform (14) mounted to the vessel and a gangway (8) mounted to the platform and having a first end (18) and a second end (20), the distance between the first and second ends being adjustable. A hook (30) extends from the gangway for enabling the second end to be mounted to the installation, and is adapted to engage a wire (36) on the installation. The position of the hook relative to the second end is adjustable, and tensioning means urges the hook towards the first end to place the wire under tension when engaged by the hook.
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