OOS Prometheus，Semi Submersible Crane& Accommodation Vessel, Main Hock 1 x 1100Tons. As the owner Ocean Challenger got involved in the later stage supervision management for the vessel in September 2012. The sea trial began in March, 2013. Yantai CIMC Raffles delivered it to OC and after that OC sold it to OOS, and OC assisted shipyard to complete the modification as OOS’s requirements. OOS Prometheus delivered to OOS on 25^th November 2013 at last and reached in Brazil on 20^th February 2014. 18^th April 2014, it succeeded to pass the inspection by Petro Bras and started to work in Brazilian water.