Abstract: Apparatus for enabling a self-contained submersible module including a length of conduit for connection to a collector to be repetitively put into place and removed. The collector (3) is located on the sea bed, and said length of conduit (14) and said collector (3) have mating ends fitted with a releasable connector suitable for establishing said connection when the ends to be connected come into end-to-end engagement. The length of conduit (14) is mounted in the module (2) on a carriage (7) to enable said length of conduit to be moved out from said module to bring one of its ends (13) into contact with the end (5) of the collector. Once the length of conduit has made connection with the end of the collector, the carriage also enables said length of conduit to be moved in the opposite direction pulling said collector with it in order to connect the other end of the conduit to a well head (1).