t 6 contain acoustic receivers r each of them comprises fig2 a tube inside which are disposed a plurality of hydrophones 6 interconnected electrically by conductors 7 in a particular embodiment each active section of the tubular element 1 may comprise two receivers r each formed by the interconnection of six to twelve hydrophones an electric connector 8 is fixed to the opposite ends of each section a multiconductor cable 9 is disposed inside each of them its different conductors interconnect a part at least of the pins of the two end connectors 8 in each of its active sections t 4 to t 6 the electric conductor 7 associated with the different receivers r are connected at one of the ends to a connector 8 their connection to the different conductors or lines of the multiconductor cable 9 is provided in said connector the density of the active sections is greater than that of the water a tubular end piece 10 is force fitted inside the end parts of each section t of the tubular element 1 fig3 each end piece comprises a head 11 of a diameter greater than that of each section and having a circular groove 12 the end pieces of two consecutive sections t of the tubular element 1 are interconnected.