Abstract: A marine tether anchoring device comprises a tubular anchor body for eventual attachment at its upper end below a marine tether and a spigot for eventual fixing to the sea bed so as to be upstanding therefrom and for reception in the anchor body to establish the anchor. Latching arms within the anchor body establish a releaseable connection to the spigot. A flexjoint supported within the tubular body transmits tensile load in the anchor body as an inwardly and upwardly directed compressive load through the latching arms to the spigot whilst permitting relative tilting movement between the latching arms and the anchor body consequent upon sway of the tether. The anchoring device can be used with large diameter thin walled tendons and the flexjoint that forms part of the device is located in a compressive part of the load path.