A floating structure is anchored relative to the seabed by a rigid arm connected at one end to the structure and at the other end to a member, preferably in the form of an enclosure and including a watertight chamber for personnel, for pivotal movement about respective horizontal axes; the member is adapted to be releasably connected to an enclosure fixed in the seabed, defines with the enclosure a chamber to be placed at atmospheric pressure and is rotatable about a vertical axis relative to the enclosure. The arm may include damper means, e.g. in the form of a jack or a horizontal articulation of upper and lower arm parts.
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