The special feature of this multiphase and multidimensional wave converter is that it exploits, in an efficient and enduring manner, substantially all of the energy in all waves of the sea, also side waves, and hence is capable of producing large amounts of cheap power. The wave converter comprises at least two buoyant elements (1) connected in a chain of rods (2A, 2B) and joints (3, 4). Each single buoyant element is in a different phase of the wave than that of the others. They will therefore absorb the energy from the relative motion and forces between each set of buoyant elements (1). Each of the elements (1) is capable of moving and pivoting in three dimensions whilst the energy from all these motions is exploited. The energy-producing devices may be comprised of fluid-driving pumps (7, 8, 9) responding to the pivoting of the joints (3,4) and the motion of the rods (2A, 2B). The wave converter absorbs energy from a varying wave spectrum and from all directions. The forces affecting the wave converter are balanced by the various buoyant elements (1), thus avoiding transmitting these forces via mooring. The wave converter provides appreciable economic advantages and durability. It may also operate at any place in the sea and the ocean, at shallow depths as well as at the large depths of the ocean.