Starting from 2001 INGV, in cooperation with INFN, performed several experiments with multidisciplinary submarine observatories installed at deep sea off the coast of Catania at the Western Ionian Sea site, the INGV Regional Facility that today contributes to the EMSO ERIC (European Multidisciplinary Seafloor and water column Observatory - European Research Infrastructure Consortium). Submarine equipment can provide real-time data to shore acquisition systems and are remotely accessible. For the management of several submarine platforms, a computer network was developed to support the systems for data management, acquisition and distribution. This technical report describes the network implementation for the simultaneous management of two submarine observatories and a Junction Box.