MS Bluefort was an accommodation vessel owned by the Canadian-based company Bridgemans Services Group LP.

Rederi AB Slite had great success with their first generation of car and passenger ferries servicing between Sweden and Finland and by the late 1970s the growing market demanded larger ships.

But with four other Viking Line ships competing for the same cars and passengers on that route, Slite still needed to break new grounds to keep themselves profitable.

Although she returned on the Stockholm-Turku during the summer of 1982, the Diana II remained on the Kapellskär-Naantali route for the rest of her Viking Line career.

Due to her pumping system at the time only operated at half of its capacity, the ship took in a substantial amount of water and partially sunk in the shallow harbour of Kapellskär.

[1] In order to finance their newbuilding Kalypso which had been a victim of the bankruptcy of Wärtsilä Marine, Rederi AB Slite had to sell the Diana II to PK-Banken in 1989.

The Diana II operated on her new route until September 1994 when she was sold to Nordström & Thulin and Estonian Shipping Company who renamed her Vironia with the intention of putting her into service within the EstLine service between Stockholm and Tallinn together with her former Viking Line fleet mate Viking Sally, by now known as Estonia.

As a result of the disaster, the Vironia was renamed Mare Balticum to avoid association with the sunken ship due to the similar name ("Viro" means "Estonia" in Finnish).

[1] Two years later, Nordström & Thulin acquired another former Viking Line vessel, Anna K. She was renamed Regina Baltica and replaced the Mare Balticum in August 1996.

[13] When the ship was delivered on 7 December 2007, the buyer was revealed to be Equinox Offshore Accommodation Ltd,[14] a Singapore-based company controlled by Norwegian interests.

In January 2008 the ARV 1 arrived at SembCorp Marine shipyards, Singapore for conversion into an accommodation and repair vessel, with the planned delivery in the third quarter of 2008.

In December 2017, the Bluefort successfully completed a contract for accommodations and CTV boat landing services in the wind farm industry in Belgium.