NOVELTY - The connector (100) has a connecting unit (115) for connecting two portions (105, 110). An alignment unit (120) aligns the portions. The portions are connectable to a mooring wire, chain or synthetic line. The alignment unit comprises a first alignment unit spanned across an internal bore of each portion and a second alignment unit i.e. rotational alignment unit, provided by other two portions. The first alignment unit is partially transverse to the bore with respect to longitudinal axes of the former portions. The alignment units are co-acted when the portions are brought together.    USE - Disconnectable permanent sub-sea mooring connector for connecting mooring wire, chain or synthetic lines i.e. polyester lines, in installation, mooring and anchoring equipments in oil, gas, offshore wind and tidal energy industries.    ADVANTAGE - The portions of the connector move back out of a receptacle by an offset amount, and a pin contacts a perimeter portion of radius when the connector is tensioned under load, thus increasing a contact area between the pin and the portions of the connector, and hence reducing contact stress between the portions and the pin and improving fatigue life of the connector. The connector provides a top entry connection e.g. male part inserted within a female part in a vertical disposition, in an easy manner, thus providing an additional security arrangement of the connection. The connector allows operators to change mooring components with an anchor handling vessel without unseating an anchor. The connector allows locking portions to be provided in engaged configuration, a blocking unit to be actuated into a blocking position and the blocking pin to retain a locking device in the engaged configuration by preventing locking pins from disengaging with slots.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for mooring a sub-sea structure by respective mooring chain lines.    DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional perspective view of a disconnectable permanent sub-sea mooring connector.    Disconnectable permanent sub-sea mooring connector (100)    Portions of connector (105, 110)    Connecting unit (115)    Alignment unit (120)    Cylindrical bore (160)