Abstract: The present invention relates to a guide device suitable for use in an offshore drilling installation, in which installation at least one drilling riser extends from a floating support to said guide devices on the seabed, said guide device being characterized in that it comprises a guide pipe in a buried position wherein said guide pipe comprises in succession: a front end resting horizontally on the seabed; a curved intermediate portion of guide pipe buried in the subsoil of the seabed at a radius of curvature that is larger, the radius of curvature preferably being greater than 500 m, and more preferably lying in the range 500 m to 1000 m; and an inclined substantially linear rear portion at the rear end of said guide pipe buried in the subsoil of the seabed at a given angle of inclination lying in the range 5° to 60°; said guide pipe co-operating with controlled burying means.