In various embodiments, a multilayer jacket for a seismic streamer is disclosed. The inner wall of the tire is concave so as to surmount a convex outer wall of the peripheral seat of a rim of a wheel, this outer wall being provided with a peripheral slot adapted to accommodate the retaining bead of the tire. An optics carrier is provided with a first receptacle for mounting a first of the electro-optical components and a second receptacle for mounting the beam forming optics. An inner member may surround the rod and provide a molten metal resistant barrier.