Fifteen years ago my MIT students and I founded a research group called DeepArch (which has an extensive website here) which laid the intellectual foundations for doing archeology in very deep water with robots.Continuing a long-standing interest in technology, archeology, and the deep sea. Dr. Brendan Foley of the Woods Hole Oceanographic institution and I are collaborating on a long-term series of explorations of the seafloor of the Aegean in Greece. Brendan has an excellent website on the project at Woods Hole
See an article from the Journal of Field Robotics: chios_jfr_finalversion
Click this image or a paper that lays out approach to archaeology in deep water with robotic vehicles (only the abstract is in Greek).