provide a production and or annulus pressure containing barrier to the environment where the open water tree cap 80 disclosed above may provide a production and or annulus pressure containing barrier to the environment referring to fig3 another embodiment of the present disclosure in addition to actuatable valve 60 installed in the bore of the internal tree cap 40 an additional actuatable valve 300 is installed in the production bore 20 below the tubing hanger 44 as shown in fig3 valve 300 is a spherical gate valve however valve 300 installed below the tubing hanger also may be a ball valve or any other type of valve for sealing a flow passageway in the desired environment valve 300 is hydraulically mechanically and or electrically actuatable between an open position and a closed position using one or more of control lines 301 302 control lines 301 302 used to open and close valve 300 may be ported to a surface or subsurface control system or to rov hot stabs for example when in the closed position valve 300 may provide a production and or annulus pressure containing barrier to the environment with or without valve 60 also being in a closed position the open water tree cap 80 disclosed above may provide a production and or annulus pressure containing barrier to the environment referring to.