NOVELTY - The barrier (65) has a wall (30) of gabions (66) extending preferably 50 meter to 500 meter with maximum 4 kilo meter below sea level (1), where a lowest end of the wall is fixed on a sea floor (11). The wall is stabilized in a vertical position and protected against erosion above the sea level by hanging and replaceable surge stoppers (41) or wave deflectors. The wall is built from steel-fence baskets or gabions filled with stones/rocks or concrete blocks. The gabions are horizontally and vertically interconnected to form a large continuous surface. Anchors are fixed to the gabions.    USE - Vertical double-gabion tsunami fence barrier for protecting bridge pillars, offshore platforms, wind power plants, light-towers, tsunami warning systems and geographical markers, submarine buildings, coasts and harbors from shock waves e.g. tsunami waves and high sea waves (all claimed) caused by storms, and assisting deep-sea mining.    ADVANTAGE - The gabions include fences having a combination of high strength and elasticity, so that the fences can stop falling rocks and protect mountain roads and railroads. The gabions are fabricated from commercially available fences with welded wires, which have symmetric high-strength properties and improved dimension control, while reducing harmful effect of reflected pressure waves on opposite coast by adjusting structure of the walls and slight downward inclination angle from vertical. The barrier is provided with triangular concrete structures that protect the basic vertical wall from erosion and can be replaced to change a tilting angle or for repair and curved outward on an upper part such that overtopping of highest waves can be minimized, replaced to test different construction designs and materials and used again when the vertical concrete wall is heightened in future. The barrier eliminates or reduces tsunami risks, prevents formation of harmful tsunami waves when the pressure waves reach reduced water depth at the coast in a cost-effective manner and at high production rates. The barrier is designed such that construction and maintenance of basket-wall dikes with surge stoppers can provide an improved stability and lifetime with occupation of less land area.    DETAILED DESCRIPTION - The gabions include fences that are coated or filled in by salt-water resistant elastic polymer such as natural or synthetic rubber, PVC, polyamide and poly-urethane, or by concrete. An INDEPENDENT CLAIM is also included for a method for constructing a double-gabion barrier.    DESCRIPTION OF DRAWING(S) - The drawing shows a front view of a gabion tsunami barrier with fixation in a sea floor and with a concrete wall on a top extending above a sea-level.    Sea level (1)    Sea floor (11)    Wall (30)    Hanging and replaceable surge stoppers (41)    Gabion tsunami barrier (65)    Gabions (66)