1. APPARATUS FOR GUIDING WELLHEAD EQUIPMENT FROM AN OPERATIONAL BASE ABOVE THE SURFACE OF A BODY OF WATER TO A PREDETERMINED POINT BELOW THE SURFACE OF THE WATER, SAID APPARATUS COMPRISING A SUPPORT BASE POSITIONED BELOW THE SURFACE OF THE WATER, A PLURALITY OF TUBULAR GUIDE COLUMNS WITH THE LOWER ENDS THEREOF BEING FIXEDLY SECURED TO SAID SUPPORT BASE AT SPACED DISTANCES ABOUT AN AXIS, A FLEXIBLE GUIDE LINE FIXEDLY SECURED TO EACH OF SAID GUIDE COLUMNS BELOW THE TOP THEREOF AND SUBSTANTIALLY COAXIAL THEREWITH, SAID GUIDE LINES EXTENDING UPWARDLY THROUGH SAID WATER TO SAID OPERATIONAL BASE THEREABOVE, AND MEANS CARRIED ON SAID OPERATIONAL BASE AND CONNECTED TO SAID GUIDE LINES FOR SUPPORTING THE UPPER ENDS THEREOF, EACH OF SAID TUBULAR GUIDE COLUMNS HAVING A LONGITUDINAL ALIGNING SLOT THEREIN IN LINE WITH A RADIUS LINE OF THE AXIS OF SAID SUPPORT BASE, SAID GUIDE COLUMNS AND SAID LONGITUDINAL SLOTS BEING ADAPTED TO RECEIVE COOPERATING GUIDE MEANS IN THE UPPER END THEREOF.