NOVELTY - The method involves partially reducing the variable positive buoyancy of a submersible platform (107). The anchoring system which anchors the platform is released afterward. Preferably, the anchoring system is fixed to a water bed at three or more anchoring points (148a,148b), and is arranged to provide a downward force to constrain the platform submerged at a given depth below the average wave height of the body of water.    USE - Raising method for submersible platform (claimed) having variable positive buoyancy and suitable for mounting power generating turbine or flowing-water drivable turbine apparatus (claimed) located in river or sea areas.    ADVANTAGE - The anchoring system may have a tripod formation of three anchoring cables which provide sufficient downward reactive force and stability to constrain a positively buoyant turbine assembly against the upward force and against drag forces caused by water current flowing past the turbine assembly. Inherent flexibility in the anchoring cables can absorb impacts against the turbine assembly or its rotors. Additional stability can be provided by additional anchoring cables without diminishing the anchoring system's ability to absorb shocks. Inherent flexibility in the anchoring cables also permits the anchoring points to be positioned at suitable sites over a large area of the sea bed for example to accommodate undulations and avoid hazards, and may widen and lengthen the anchoring system's footprint, increasing stability to counteract any increased overturning moment experienced by the turbine assembly at a greater elevation above the water bed. The net positive buoyancy may be selected to be sufficient to constrain the turbine assembly against a reactive downward force provided by an anchoring system, to maintain that position under external downward vertical forces up to a selected threshold force, and to enable the turbine assembly to be downwardly displaced in the event that the downward vertical force exceeds the selected threshold force. The anchoring cable may avoid the need to retrofit a vortex suppressant system or device in order to reduce vortex induced vibration, wandering and hydrodynamic drag caused by water flow around the anchoring cable. Different turbines from different manufacturers can operate alongside each other without modification to the turbine support, thus improving flexibility in repair and maintenance and reducing cost, time and energy.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following:    (1) a submersible apparatus for supporting a turbine for generating electrical power from flowing water;    (2) a remotely controllable unmanned surface vessel for controlling a submersible;    (3) a method of controlling a flowing water drivable turbine apparatus; and    (4) a flowing water drivable turbine apparatus.    DESCRIPTION OF DRAWING(S) - The drawing shows the side view of a turbine assembly before and after being raised to the water surface.    Submersible platform (107)    Turbine (132)    Anchoring cables (145a,145b)    Anchoring points (148a,148b)    Vessel (1002)