Initially christened MS Golfo Dei Delfini, Baie de Seine was acquired by DFDS Seaways before entering service. She was rebuilt with extra passenger accommodations to be operated on the Harwich to Esbjerg route. The hull is constructed of steel with an aluminum alloy superstructure. As Sirena Seaways, the ship had space for 623 passengers and 423 cars. Her sister the is operated by DFDS subsidiary Lisco Lines. She was serviced and repainted in February 2013. During this time the ship was rebranded as Sirena Seaways. On 22 June 2013, the ship collided with the dock at Parkeston Quay, which resulted in puncture holes in the hull below the water line. Although passengers were stranded on board the ship for two hours, the leak was brought under control, and there were no serious injuries. The Harwich to Esbjerg route ceased on 29 September 2014 due to loss of passenger traffic. DFDS Seaways closed the route to cut operating costs in order to make the company more competitive. As a result, Sirena Seaways was deployed elsewhere on the DFDS Seaways network. Later, DFDS Seaways reported that Sirena Seaways was to be moved to other routes such as the Paldiski - Kapellskär route between Estonia and Sweden. It began being used on this route on 6 October 2014. Sirena Seaways was laid-up in Gdańsk during the winter of 2014/15. She received new gas-filters to meet new European regulations covering sulphuremissions. After the fitting of new gas filters, Sirena Seaways briefly entered service between Klaipeda and Karlshamn. In 2015, Brittany Ferries began the charter of Sirena Seaways. The company announced that she would be named MV Baie de Seine, and that she will have a livery similar to that of MV Étretat for use on the Brittany Ferries économie service.. Baie de Seine entered service on May 9, 2015 with a freight-only sailing between Portsmouth and Bilabo. The vessel sailed its first passenger service with Brittany Ferries on May 11, 2015, between Portsmouth and Le Harve. During the charter to Brittany Ferries, Baie de Seine operated between Portsmouth and Le Harve, whilst also operating some services between Portsmouth and Spain. In 2017, Brittany Ferries announced that Baie de Seine would return to DFDS Seaways in 2020. Baie de Seine will be replaced by a newer vessel on order called Galicia, with routes covered by another vessel called Connemara, whilst Brittany Ferries wait for to Galicia arrive. In March 2020, Baie de Seine left Brittany Ferries and returned to DFDS Seaways. The vessel was returned to her former name of Sirena Seaways, and reflagged under the Lithuanian flag, with the home port of Klaipeda. The vessel was also repainted in the new DFDS colour scheme. As of April 2020, Sirena Seaways returned to service between Klaipeda and Karlshamn.
