A disconnectable spread mooring assembly for a vessel (V) floating at a water surface (L), the vessel (V) having a bow and a stern, the disconnectable spread mooring assembly comprising: a forward chain table assembly (20") releasably connected to the vessel (V) at the bow; an aft chain table assembly (22") releasably connected to the vessel (V) at the stern, wherein each of the forward and aft chain table assemblies (20", 22") comprises one or more buoyancy compartments and the forward and aft chain table assemblies (20", 22") are arranged and designed to float at or near the water surface (L) when disconnected from the vessel (V); a plurality of bow mooring legs having first ends attached to the forward chain table assembly (20") and having second ends capable of being anchored at spaced locations on a seafloor (F); a plurality of stern mooring legs having first ends attached to the aft chain table assembly (22") and having second ends capable of being anchored at spaced locations on the seafloor (F); a first connector assembly connecting the forward chain table assembly (20") to the vessel (V) at the bow; a second connector assembly connecting the aft chain table assembly to the vessel at the stern, wherein the first and second connector assemblies are arranged and designed to unlock and release the forward and aft chain table assemblies (20", 22") from the vessel (V); a first tie-back hawser or chain, or combination of hawser and chain, connected to the forward chain table assembly (20"); a second tie-back hawser or chain, or combination of hawser and chain, connected to the aft chain table assembly (22"); and one or more fixed jacket structures fixed to the seafloor (F), wherein the first and second tie-back hawsers or chains, or combinations of hawser and chain, are arranged and designed to connect to the one or more fixed jacket structures when the forward and aft chain table assemblies (20", 22") float at or near the water surface (L). a forward chain table assembly (20") releasably connected to the vessel (V) at the bow; an aft chain table assembly (22") releasably connected to the vessel (V) at the stern, wherein each of the forward and aft chain table assemblies (20", 22") comprises one or more buoyancy compartments and the forward and aft chain table assemblies (20", 22") are arranged and designed to float at or near the water surface (L) when disconnected from the vessel (V); a plurality of bow mooring legs having first ends attached to the forward chain table assembly (20") and having second ends capable of being anchored at spaced locations on a seafloor (F); a plurality of stern mooring legs having first ends attached to the aft chain table assembly (22") and having second ends capable of being anchored at spaced locations on the seafloor (F); a first connector assembly connecting the forward chain table assembly (20") to the vessel (V) at the bow; a second connector assembly connecting the aft chain table assembly to the vessel at the stern, wherein the first and second connector assemblies are arranged and designed to unlock and release the forward and aft chain table assemblies (20", 22") from the vessel (V); a first tie-back hawser or chain, or combination of hawser and chain, connected to the forward chain table assembly (20"); a second tie-back hawser or chain, or combination of hawser and chain, connected to the aft chain table assembly (22"); and one or more fixed jacket structures fixed to the seafloor (F), wherein the first and second tie-back hawsers or chains, or combinations of hawser and chain, are arranged and designed to connect to the one or more fixed jacket structures when the forward and aft chain table assemblies (20", 22") float at or near the water surface (L). <EOS>