Floating platform for the surveillance of a maritime zone, said floating platform comprising telecommunication means adapted to exchange surveillance related information with a Command, Communication and Control center and with other available surveillance means selected from a group comprising telecommunication satellites, GPS satellites, flying radars, flying relays, airplanes, surface vessels, underwater vessels and unmanned vehicles, said floating platform is unmanned, autonomous, adapted to maintain a fixed location and it is adapted to provide a continuous and persistent surveillance of a sea surface area and of the aerial and underwater space pertaining to said sea surface area of said maritime zone under surveillance, characterized in that said floating platform comprises in combination: a deck being provided with a vertically oriented mast of substantial length within a range of 40-50 m above sea level, equipment (5, 7, 8) adapted to provide surveillance of the sea surface area and the overlying aerial space being mounted onto the deck, as well as at a top end and longitudinally along said mast, said equipment (5, 7, 8) being selected to combine a variety of surveillance equipment including radar, lidar, sodar, electro-optic sensors, thermal sensors and telecommunication systems; a system of floaters with a first connecting member adapted to connect said system of floaters to said deck and to maintain the deck above the sea surface at a height exceeding an anticipated wave height at the location of installation of the floating platformsaid system of floaters comprising a central floater and circumferential floaters arranged symmetrically around the central floater, tubular members (21, 22) being provided for connecting adjacent circumferential floaters and tubular members (19, 20) being provided for connecting each of said circumferential floaters with the central floater, a second connecting member being provided to extend from a bottom side of each one of the circumferential floaters to an anchorage being mounted onto the seabed, a plurality of transmitter/receiver sonar devices adapted to provide surveillance of underwater space being provided at the bottom side of each one of the circumferential floaters and/or longitudinally along each one of said second connecting members; power generation means adapted to provide energy autonomy of said floating platform, comprising a power generation unit and a fuel storage unit installed within the central floater and power generation units from renewable energy sources and a storage unit for storage of energy produced by said power generation units installed onto the deck, an energy management unit being adapted to provide energy supply to serve energy requirements of said floating platform alternatively from said power generation units from renewable energy sources and/or the energy storage unit or from said power generation unit. a deck being provided with a vertically oriented mast of substantial length within a range of 40-50 m above sea level, equipment (5, 7, 8) adapted to provide surveillance of the sea surface area and the overlying aerial space being mounted onto the deck, as well as at a top end and longitudinally along said mast, said equipment (5, 7, 8) being selected to combine a variety of surveillance equipment including radar, lidar, sodar, electro-optic sensors, thermal sensors and telecommunication systems; a system of floaters with a first connecting member adapted to connect said system of floaters to said deck and to maintain the deck above the sea surface at a height exceeding an anticipated wave height at the location of installation of the floating platformsaid system of floaters comprising a central floater and circumferential floaters arranged symmetrically around the central floater, tubular members (21, 22) being provided for connecting adjacent circumferential floaters and tubular members (19, 20) being provided for connecting each of said circumferential floaters with the central floater, a second connecting member being provided to extend from a bottom side of each one of the circumferential floaters to an anchorage being mounted onto the seabed, a plurality of transmitter/receiver sonar devices adapted to provide surveillance of underwater space being provided at the bottom side of each one of the circumferential floaters and/or longitudinally along each one of said second connecting members; power generation means adapted to provide energy autonomy of said floating platform, comprising a power generation unit and a fuel storage unit installed within the central floater and power generation units from renewable energy sources and a storage unit for storage of energy produced by said power generation units installed onto the deck, an energy management unit being adapted to provide energy supply to serve energy requirements of said floating platform alternatively from said power generation units from renewable energy sources and/or the energy storage unit or from said power generation unit.