A well killing system comprising: a relief well; a primary well having a wellhead; a blowout preventer; a relief well drilling system positioned at a surface of a body of water; a pipe extending from said relief well drilling system to said blowout preventer; a relief well injection spool comprising: a body having a pair of inlets (22, 24) opening to a bore on an interior of said body, each of said pair of inlets (22, 24) having a valve (26, 28, 34, 36) cooperative therewith; a ram cooperative with said bore of said body, said ram being selectively movable so as to open and close said bore; an upper connector affixed to said body so as to connect said body to a lower end of said blowout preventer, said upper connector opening to a said bore of said body; and characterized by: a wellhead connector affixed to a lower end of said body, said wellhead connector connected to said relief well, said wellhead connector opening to the bore of said body; and a first line having one end connected to one of said pair of inlets (22, 24), said first line extending toward the surface of the body of water, said first line adapted to pass a kill fluid to one of said pair of inlets (22, 24) of said body. a relief well; a primary well having a wellhead; a blowout preventer; a relief well drilling system positioned at a surface of a body of water; a pipe extending from said relief well drilling system to said blowout preventer; a relief well injection spool comprising: a body having a pair of inlets (22, 24) opening to a bore on an interior of said body, each of said pair of inlets (22, 24) having a valve (26, 28, 34, 36) cooperative therewith; a ram cooperative with said bore of said body, said ram being selectively movable so as to open and close said bore; an upper connector affixed to said body so as to connect said body to a lower end of said blowout preventer, said upper connector opening to a said bore of said body; and characterized by: a wellhead connector affixed to a lower end of said body, said wellhead connector connected to said relief well, said wellhead connector opening to the bore of said body; and a first line having one end connected to one of said pair of inlets (22, 24), said first line extending toward the surface of the body of water, said first line adapted to pass a kill fluid to one of said pair of inlets (22, 24) of said body. a body having a pair of inlets (22, 24) opening to a bore on an interior of said body, each of said pair of inlets (22, 24) having a valve (26, 28, 34, 36) cooperative therewith; a ram cooperative with said bore of said body, said ram being selectively movable so as to open and close said bore; an upper connector affixed to said body so as to connect said body to a lower end of said blowout preventer, said upper connector opening to a said bore of said body; and characterized by: a wellhead connector affixed to a lower end of said body, said wellhead connector connected to said relief well, said wellhead connector opening to the bore of said body; and a first line having one end connected to one of said pair of inlets (22, 24), said first line extending toward the surface of the body of water, said first line adapted to pass a kill fluid to one of said pair of inlets (22, 24) of said body. a wellhead connector affixed to a lower end of said body, said wellhead connector connected to said relief well, said wellhead connector opening to the bore of said body; and a first line having one end connected to one of said pair of inlets (22, 24), said first line extending toward the surface of the body of water, said first line adapted to pass a kill fluid to one of said pair of inlets (22, 24) of said body.