Installation (10; 150; 160; 170) for the extraction of fluid from an expanse of water, comprising: - an upper structure extending at least in part above the surface of the expanse of water; - at least one flexible hose extending through the expanse of water, the flexible hose comprising a head for connection to a collector placed on the upper structure, the flexible hose being capable of moving through the expanse of water between an upper configuration in which it is connected to the collector and a lower disconnected configuration; wherein the installation (10; 150; 160; 170) comprises: - a lower structure which is completely immersed in the expanse of water and has a base extending at a distance from the bottom of the expanse of water and means for holding the base in position relative to the bottom of the expanse of water, the upper structure being capable of moving relative to the lower structure between an extraction position located substantially opposite and above the lower structure and an evacuation position located at a distance from the lower structure, wherein the base defines for the or each flexible hose: - at least a passage for the travel of the flexible hose as it moves between the upper connected configuration and the lower disconnected configuration - at least a stop for retaining the connection head, the stop being disposed in the travel passage, to hold the connection head at a distance from the bottom of the expanse of water in the lower disconnected configuration, characterized in that the base defines an upper surface for securing the upper structure the upper surface being placed at a depth greater than 150 m at least in the extraction position and in the evacuation position, and in that the installation comprises means for shaping the or each flexible hose below the lower structure, the shaping means comprising at least one arch disposed in the vicinity of the lower structure, the flexible hose being engaged over the arch so as to have a wave-shaped run or a S-shaped run at one outlet of the travel passage, or consist of a number of annular buoys surrounding and supporting the or each hose at an upper portion of a wave shaped run. - an upper structure extending at least in part above the surface of the expanse of water; - at least one flexible hose extending through the expanse of water, the flexible hose comprising a head for connection to a collector placed on the upper structure, the flexible hose being capable of moving through the expanse of water between an upper configuration in which it is connected to the collector and a lower disconnected configuration; wherein the installation (10; 150; 160; 170) comprises: - a lower structure which is completely immersed in the expanse of water and has a base extending at a distance from the bottom of the expanse of water and means for holding the base in position relative to the bottom of the expanse of water, the upper structure being capable of moving relative to the lower structure between an extraction position located substantially opposite and above the lower structure and an evacuation position located at a distance from the lower structure, wherein the base defines for the or each flexible hose: - at least a passage for the travel of the flexible hose as it moves between the upper connected configuration and the lower disconnected configuration - at least a stop for retaining the connection head, the stop being disposed in the travel passage, to hold the connection head at a distance from the bottom of the expanse of water in the lower disconnected configuration, characterized in that the base defines an upper surface for securing the upper structure the upper surface being placed at a depth greater than 150 m at least in the extraction position and in the evacuation position, and in that the installation comprises means for shaping the or each flexible hose below the lower structure, the shaping means comprising at least one arch disposed in the vicinity of the lower structure, the flexible hose being engaged over the arch so as to have a wave-shaped run or a S-shaped run at one outlet of the travel passage, or consist of a number of annular buoys surrounding and supporting the or each hose at an upper portion of a wave shaped run. - a lower structure which is completely immersed in the expanse of water and has a base extending at a distance from the bottom of the expanse of water and means for holding the base in position relative to the bottom of the expanse of water, the upper structure being capable of moving relative to the lower structure between an extraction position located substantially opposite and above the lower structure and an evacuation position located at a distance from the lower structure, wherein the base defines for the or each flexible hose: - at least a passage for the travel of the flexible hose as it moves between the upper connected configuration and the lower disconnected configuration - at least a stop for retaining the connection head, the stop being disposed in the travel passage, to hold the connection head at a distance from the bottom of the expanse of water in the lower disconnected configuration, characterized in that the base defines an upper surface for securing the upper structure the upper surface being placed at a depth greater than 150 m at least in the extraction position and in the evacuation position,