Abstract: A connector for making an optical and/or electrical connection underwater or in a wet or severe environment, comprising first and second connector parts which are axially interengageable to establish the optical or electrical connection, the first connector part having relatively movable portions for relative movement to allow the optical or electrical connection to be established when the first and second connector parts are interengaged, and having latching means to prevent such relative movement. The latching means is preferably releasable by engagement with the second connector part.