that delivers electrical and hydraulic power and control signals the operator can then remove plug 63 to initiate well fluid production from subsea well assembly 11 this may be handled with a subsea plug removal tool such as shown in u s pat no 6 719 059 that is lowered on a lift line and attached to tree cap profile 45 with the assistance of an rov upon removing plug 63 the operator opens valve 30 to communicate well fluids from string of tubing 23 to a subsea manifold or to a collection facility located on a surface for workover operations through tubing 23 the operator may attach a riser to tree cap 33 and perform operations through tubing 23 such as wire line operations for a workover operation requiring the retrieval of tubing 23 the operator can install wire line plug 63 back in tubing hanger 21 using a subsea plug retrieval tool then retrieve tree cap 33 on a lift line the operator would then attach a workover or drilling riser to spool 27 and pull tubing hanger 21 and tubing 23 in a conventional manner through the workover riser prior to pulling tubing hanger 21 the operator would typically render the well safe by u201c killing u201d in a routine manner well circulation would be in the same manner as during completion which is via running tool 61 tubing annulus passage 24 in tubing hanger 21 and tubing 23 if desired the workover operation may include further drilling such as drilling a sidetracked portion of the well to a more productive zone in one method the operator pulls tubing hanger 21 and production tubing 23 through spool 27 and the workover or drilling riser the operator would then lower a drill string through.