a connection assembly allowing a pipe extending from the seabed to be connected to a flexible pipe leading to the sea surface . the assembly includes a turret having an upper end connected to a float and a lower end connected to the pipe . the turret has a duct extending towards the upper end and having a free end provided with an end fitting . the turret includes retaining members that keep the connector between the turret and the end fitting , facing the end fitting . the connector is in a fixed position in relation to the retaining members and a drive device drives the end fitting toward the connector .