Abstract: A towed streamer including a hydrophone (1) supported, in a filler (4) being either liquid or semi-liquid such as a gel having wave damping properties, within a housing (2). The housing (2) is in the form of a tube whose ends are closed by closures such as rigid plugs (3). Where liquid is used wave damping baffles such as open cell foam structures are provided. A rigid shielding arrangement in the form of reinforcing strips (5) can be provided to shield the hydrophone from bulge waves.

Abstract: A towed streamer including buoyant core (1), and strength members (3) to transmit tension along the streamer. Strength members (3) are arranged so that the streamer is compliant for a predetermined elongation of the streamer. Members (3) are embedded in an inner jacket (5) surrounded by an outer jacket (6). The assembly is encased in an extruded outer jacket (2). Braided data bearers (4) can be provided between the inner jackets (5, 6). Strength members (3) can be braided with interstices impregnated with gel. Where the strength members (3) are of non-compliant material, the braid is initially compliant where the streamer is slightly elongated but becomes non-compliant as the streamer elongates further. Alternatively a combination of compliant (3) and non-compliant members (14) can be used where the compliant members (3) only become engaged after a predetermined elongation of the streamer.