A submarine optical connector, arranged so as to be able to be connected and disconnected under water, said connector being arranged, in case of connection, to perform a cleaning prior to the connection by a circulation of liquid, for example a gel, between a first and a second support element inside the connector, said connector comprising: - a first part comprising the first support element for supporting a first optical fibre, said first support element including at least one alignment pin (31, 31'), - a second part comprising the second support element for supporting a second optical fibre, said second support element including at least one through hole intended to receive respectively said at least one alignment pin to guide the first and second support elements towards a contact position in which the first and second fibres are connected, and - sealing means (41, 42, 43) to protect the first and second fibres from the external environment at least when the first and second support elements are in the contact position, said sealing means comprising a first sealing means to ensure the seal-tightness of the first part when said first part is disconnected from the second part, a second sealing means to ensure the seal-tightness of the second part when said second part is disconnected from the first part, and a third sealing means to protect the connector from the external environment when the first and second parts are connected together, said third sealing means comprising a seal arranged at one end of one of the parts, said seal being arranged, when the first and second parts are connected together, so as to allow the circulation of liquid inside the connector towards the outside, to dispel any impurities from the optical contact, and to prevent the circulation of liquid in the reverse direction, wherein the connector is arranged so that the first and second sealing means switch from a seal-tight closed position to an open position when the third sealing means is in a position of protection from the external environment, and the connector includes at least one stud to maintain a clearance between the first part and the second part when the first and second parts are connected together for the passage of cleaning gel towards the outside of the connector. - a first part comprising the first support element for supporting a first optical fibre, said first support element including at least one alignment pin (31, 31'), - a second part comprising the second support element for supporting a second optical fibre, said second support element including at least one through hole intended to receive respectively said at least one alignment pin to guide the first and second support elements towards a contact position in which the first and second fibres are connected, and - sealing means (41, 42, 43) to protect the first and second fibres from the external environment at least when the first and second support elements are in the contact position, said sealing means comprising a first sealing means to ensure the seal-tightness of the first part when said first part is disconnected from the second part, a second sealing means to ensure the seal-tightness of the second part when said second part is disconnected from the first part, and a third sealing means to protect the connector from the external environment when the first and second parts are connected together, said third sealing means comprising a seal arranged at one end of one of the parts, said seal being arranged, when the first and second parts are connected together, so as to allow the circulation of liquid inside the connector towards the outside, to dispel any impurities from the optical contact, and to prevent the circulation of liquid in the reverse direction, a first sealing means to ensure the seal-tightness of the first part when said first part is disconnected from the second part, a second sealing means to ensure the seal-tightness of the second part when said second part is disconnected from the first part, and a third sealing means to protect the connector from the external environment when the first and second parts are connected together, said third sealing means comprising a seal arranged at one end of one of the parts, said seal being arranged, when the first and second parts are connected together, so as to allow the circulation of liquid inside the connector towards the outside, to dispel any impurities from the optical contact, and to prevent the circulation of liquid in the reverse direction,