Deployable underwater device

An underwater device intended to be deployed in the water, the device comprising:

• a set of arms articulated to a support body having a reference axis r, the arms being able to be kept in a furled configuration and able to deploy into a deployed configuration wherein the arms extend about the reference axis r, the arms deploying by distal ends (ED) of the arms moving away from the axis r,
• a set of at least one bending spring stressed elastically in bending when the arms are kept in a furled configuration and able to relax when the arms are released from the furled configuration, the set of at least one bending spring being configured and arranged in such a way as to exert, on at least one of the arms, when the arms are released from the furled configuration, a thrust that instigates the deploying of the arms,
• wherein at least one bending spring comprises an anchoring part (PA) that is fixed with respect to the reference axis r and a deformable part (PD) that deforms when said bending spring relaxes, the deformable part (PD) being wound around the reference axis when the arms are being kept in the furled configuration, and unwinding as said bending spring relaxes.