Patent Number: 
Section: claims

1. An underwater electricity generation module comprising:an elongate cylindrical casing (12) incorporating therein an electricity generation unit (25a, 25b) comprising a nuclear boiler (28, 29) associated with electricity generation means (30, 31) connected to an external electricity distribution post (7) by electric cables (6), a lower portion of the casing (12) being provided with a base (14) that rests on a bed of a water body and anchoring means (15) for anchoring the module to the bed,wherein the base (14) is a sledge which extends from one end of the casing (12) to the other and the ends (50, 51) of which are curved in the form of a spatula at each end of the casing (12), and including zones for absorbing variations in the length of the casing (12), linked to the variation in the pressure applied thereto when submerged or surfaced. 2. The underwater electricity generation module according to claim 1, wherein the zones for absorbing the length variations comprise telescoping portions of the beams. 3. The underwater electricity generation module according to claim 1, wherein the zones for absorbing the length variations comprise elastically deformable bellows portions of the beams. 4. The underwater electricity generation module according to claim 1, wherein the sledge includes a longitudinal central beam that extends between the ends of the sledge. 5. An underwater electricity generation module comprising:an elongate cylindrical casing (12) incorporating an electricity generation unit (25a, 25b) comprising a nuclear boiler (28, 29) associated with electricity generation means (30, 31) connected to an external electricity distribution post (7) by electric cables (6), a lower portion of the casing (12) being provided with a base (14) that rests on a bed of a water body and anchoring means (15) for anchoring the module to the bed,wherein the base (14) is a sledge which extends from one end of the casing (12) to the other and the ends (50, 51) of which are curved in the form of a spatula at each end of the casing (12), and including zones for absorbing variations in the length of the casing (12), linked to the variation in the pressure applied thereto when submerged or surfaced, andwherein the sledge includes a beam-based structure including a central beam (52) and two side beams (53, 54), connected to one another by reinforcing and connecting arms (55), and the ends of which are bent and curved to be fastened to one another at the spatula-shaped end at each end of the casing (12). 6. The underwater electricity generation module according to claim 5, wherein the two side beams (53, 54) are connected to the casing (12) by support columns (56). 7. The underwater electricity generation module according to claim 6, wherein the central beam (52) comprises support block means (57) for the casing (12). 8. The underwater electricity generation module according to claim 6, wherein the central beam (52) comprises ballast means (58). 9. The underwater electricity generation module according to claim 5, wherein the central beam (52) comprises support block means (57) for the casing (12). 10. The underwater electricity generation module according to claim 9, wherein the central beam (52) comprises ballast means (58). 11. The underwater electricity generation module according to claim 5, wherein the central beam (52) comprises ballast means (58). 12. The underwater electricity generation module according to claim 5, wherein the zones for absorbing the length variations comprise telescoping portions of the beams. 13. The underwater electricity generation module according to claim 5, wherein the zones for absorbing the length variations comprise elastically deformable bellows portions of the beams.