An optical cable for communication includes at least one micromodule, wherein the micromodule is blocked with respect to the propagation of water. The at least one micromodule includes at least one optical fiber, a retaining element for housing the at least one optical fiber, and a thixotropic filling compound arranged within the retaining element. The filling compound is thixotropic, has a viscosity higher than or equal to 700 Pas at zero shear rate and at a first temperature of 20.degree. C., a loss modulus G'' lower than or equal to 3000 MPa at 1 Hz and at a second temperature of -45.degree. C., and is compatible with the retaining element.