Submerged calm buoy

A catenary anchor leg mooring (CALM) buoy comprising a body with buoyancy means for connecting the buoyant body to catenary anchor chains to anchor the body to the seabed, a turntable being rotatablewith respect to the body with buoyancy, said turntable having mooring means for a floating unit such as a vessel, a swivel and means for connecting at least one hose between at least one swivel and asubmerged pipe structure extending over or into the seabed to any subsea well or the like as well as means for connecting at least one hose between at least one swivel and at least one vessel, wherein the CALM buoy is provided with catenary anchor chains which have a weight such that the CALM buoy as a whole is kept underwater at least during normal practice.