Abstract: Equipment which extends from a floating structure towards the ocean floor therebelow is supported on the floating structure by a device which includes at least two hydraulic cylinders which are arranged between the floating structure and the equipment, the hydraulic cylinders being connected to a source of hydraulic pressure fluid, and a valve apparatus which is connected via a first conduit to each hydraulic cylinder on the piston rod side of its piston and via a second conduit to each hydraulic cylinder on the opposite side of its piston. The valve apparatus connects the first and second conduits for each hydraulic cylinder under normal conditions, but under deviant pressure conditions in one hydraulic cylinder breaks the connection between the first and second conduits of the other hydraulic cylinders and connects their first conduits with the first and second conduits of the deviant hydraulic cylinder.