the present invention is directed to methods and apparatus to construct subsea wells with redundant parallel fluid flow control systems to allow new methods to stop subsea blow outs . more specifically , this invention provides methods and apparatus to construct subsea wells with a plurality of redundant parallel paths allowing for the first time drill pipe and other intervention conduits , wire line , and fluids to be deployed below a damaged drilling riser and or a damaged blow out preventer through a separate blow out preventer and riser system presented in this invention .