The invention concerns a floater comprising a pod (6) similar to standard floaters, but in this particular case with a strut (7) mounted thereon such that the pod is entirely submerged. Such an arrangement, combined with other secondary ones, enables to reduce vertical oscillations of the floater caused by the swell while providing it with suitable stability towards other perturbations. Thus, a structure (1) suspended to the floater (5) and forming part of a line (2, 3) towed by a ship remains at a constant depth. The invention is applicable, for instance, to seismic tests at sea.
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