appears larger in the figure than the riser 14 or along the outside of the riser if the control head 7 is lowered on the outside of the riser 14 then a track of some sort should be provided utilizing the control head 7 and transponders 32 and 34 the lowermost end of the marine riser 14 is positioned over the auxiliary borehole 26 the drill string 38 is extended to controllably lower the riser 14 into the auxiliary borehole 26 the control head 7 and cable 9 connected therewith are retracted when the lowermost end of the marine riser 14 passes below the rim of funnel 28 after the riser 14 is fully lowered into the bore 26 riser running tool 4 is remotely detached the drill string 38 is withdrawn and the vessel 10 may be moved to properly hang the riser 14 in the auxiliary borehole 26 the upper end of the riser 14 is provided with a flange 42 or other similar device to engage a riser hanger 44 at the auxiliary borehole mouth to restore operation at the original site the vessel 10 is first positioned above the auxiliary borehole 26 then the riser running tool 4 and the control head 7 are disconnectably connected to the lowermost end of the drill string 38 and the drill string 38 is lowered to a position immediately below the rim of the funnel 28 the control head 7 is then released from the drill string 38 and the riser running tool 4 is connected with the uppermost end of the marine riser 14 the control head 7 is returned to the drilling vessel 10 by the cable 9.