Within I-RIM 3D we are organizing a two hours long Workshop on Marine Robotics. Over 70% of our planet's surface is covered by water and over 96% of all Earth's water is in the oceans. The oceans host a wealth of natural resources and play a key role in environmental and climate change processes. Robotics may provide fundamental tools for studying, understanding, and exploiting the marine environment. Marine Robotics is characterized by specific challenges related to the adverse and harsh physical conditions (underwater pressure, waves, tides, currents, winds, salinity, fouling, etc.) as well as technological issues (unavailability of electromagnetic transmissions underwater, low bandwith acoustic communications, complex power management policies, etc.). The Workshop's aim is to cover the wide range of scientific, industrial and application interests regarding marine robotics. The language will be technical, but not academic aiming at making the contents enjoyable by a not necessarily highly specialized audience. The speakers will illustrate recent trends and technologies and will provide a glance of possible future developments.