A receiving assembly (2) for receiving a seagoing vessel (1), which can be suspended on a hinged arm (4) of a handling structure (3) provided with a lifting cable (8) intended to lift a seagoing vessel (1) and to move said vessel in a vertical direction (z), so as to deploy and/or recover said vessel (1) in the sea from a floating building (5) whereon said handling structure (3) is secured, said receiving assembly (2) comprising a lower portion (14) comprising receiving means (16) for receiving said vessel (1), said receiving means (16) having a passage through which the cable (8) can pass, said receiving means (16) defining a hollow that can receive said vessel (1) when said vessel is suspended by means of the lifting cable (8) and being arranged so as to block the rotational and translational movements according to the vertical upward direction (z), of a seagoing vessel (1) having a generally tubular shape, relative to the receiving means (16), when the seagoing vessel (1) is received by the hollow and comes to bear against said means.