1) CETO project (Australia) [8]. The CETO system distinguishes itself from other traditional WEC by being a fully submerged, pumping technology with the power generated onshore by a standard hydroelectric turbine system (Fig. 6). The high-pressure seawater is also used to supply a reverse osmosis desalination plant. 2) SEAREV project (France) [9]. The SEAREV WEC is a floating device enclosing a heavy horizontal axis wheel serving as an internal gravity reference (Fig. 7). The wheel gravity centre being off-centered, this component behaves mechanically like a pendulum. The rotational motion of this pendulum wheel relative to the hull activates a hydraulic PTO system which, in turn, set an electric generator into motion. Two major advantages of this arrangement are; (1) All the moving parts (mechanic, hydraulic, electric, components) are sheltered from the sea action inside a closed and waterproof shell. (2) A wheel pendulum involves neither end stop nor any security system limiting the stroke.