Abstract: A tunnel is built in successive sections by a machine suitable for operating at the surface and in immersion that is displaced in the water on the sub-sea soil. This machine includes a fluid-tight working space (6) for accommodating the personnel and equipment required for construction. Further, this space has a rearward-facing opening for building and erecting a section at the rear of the machine. The forward section of the machine includes a ballastable chamber (7) which prepares and grades the soil for erection of a section.

Abstract: The present invention relates to a water movement device comprising a flexible wall (1) placed in water close to the surface, substantially vertically in a static rest state, made up of optionally perforated (5) massive unit blocks (4) assembled to one another in strings by cables (2, 3) on which said blocks (1) are threaded or on which said blocks are crimped, said cables comprising: a series of cables (2) disposed vertically (ZZ?) side by side, parallel to one another, and a second series of cables (3) disposed horizontally (XX?) one above another and in parallel, and said vertical cables (2) being suspended or tensioned at their top ends and/or respectively tensioned or moored at their bottom ends, and said blocks including empty orifices (5) passing through them between the front and rear faces (1-1, 1-2) of said wall (1), and/or empty spaces (7) between said blocks, such that said orifices (5) and/or empty spaces between said blocks (7), if any, confer overall porosity on said wall lying in the range 5%

Abstract: The present invention relates to a water movement device comprising a flexible wall (1) placed in water close to the surface, substantially vertically in a static rest state, made up of optionally perforated (5) massive unit blocks (4) assembled to one another in strings by cables (2, 3) on which said blocks (1) are threaded or on which said blocks are crimped, said cables comprising: a series of cables (2) disposed vertically (ZZ?) side by side, parallel to one another, and a second series of cables (3) disposed horizontally (XX?) one above another and in parallel, and said vertical cables (2) being suspended or tensioned at their top ends and/or respectively tensioned or moored at their bottom ends, and said blocks including empty orifices (5) passing through them between the front and rear faces (1-1, 1-2) of said wall (1), and/or empty spaces (7) between said blocks, such that said orifices (5) and/or empty spaces between said blocks (7), if any, confer overall porosity on said wall lying in the range 5%

Abstract: The tunnel is built in successive sections by means of a machine M suitable for operating at the surface and in immersion that is displaced in the water on the sub-sea soil, this machine comprising a fluid-tight working space (6) for accommodating the personnel and equipment required for construction, this space having a rearward-facing opening for building and erecting a section at the rear of the machine and the machine comprising in its forward section a ballastable chamber (7) equipped with means (21-23) for preparing and grading the soil in readiness for erection of a section. Application to construction of a tunnel on the bottom of a body of water.