Connector unit and method

Connector A connector unit comprising:

• a first connector part and a second connector part;
• wherein the first connector part has at least a first volume compensating chamber that is pressure compensated against an ambient environment, and has at least one contact support element that at least partly enters the second connector part of the connector unit during mating of the connector unit;
• wherein the second connector part of the connector unit has at least a second volume compensating chamber that is pressure compensated against the ambient environment;
• and
• a communication chamber that is in flow communication with the first volume compensating chamber, of the first connector part when the connector unit is in an unmated state;
• and wherein the communication chamber is in flow communication with the second volume compensating chamber of the second connector part when the connector unit is in a mated state;
• wherein the connector unit is configured such that during mating of the first connector part and the second connector part, flow communication between the communication chamber and the first volume compensating chamber of the first connector part is interrupted and the communication chamber is separated from the first volume compensating chamber by closing a first passageway and the communication chamber is brought into flow communication with the second volume compensating chamber of the second connector part by uncovering an aperture so that a second passageway and consequently the communication chamber is opened, so that the communication chamber is pressure compensated via the second volume compensating chamber in the mated state of the connector unit.