A current drive to produce oil in deeper and deeper waters has pushed many oil companies to look into new technologies and to lower costs for their field developments. Reducing the lead-time to first oil is often vital in order to see a quicker return on the investment. This is often achieved by starting production before the drilling phase is over. MARIN has been heavily involved in testing one particular state-of-the-art concept, SBM's Tension Leg Deck (TLD). Here Report looks at its ability to operate in harsh environments.