Siem Offshore is an international supply and subsea

Subsea

Subsea is a general term frequently used to refer to equipment, technology, and methods employed in marine biology, undersea geology, offshore oil and gas developments, underwater mining, and offshore wind power industries.- Oil and gas :...

 shipping company registered on the Cayman Islands

Cayman Islands

The Cayman Islands is a British Overseas Territory and overseas territory of the European Union located in the western Caribbean Sea. The territory comprises the three islands of Grand Cayman, Cayman Brac, and Little Cayman, located south of Cuba and northwest of Jamaica...

 with main offices in Kristiansand

Kristiansand

-History:As indicated by archeological findings in the city, the Kristiansand area has been settled at least since 400 AD. A royal farm is known to have been situated on Oddernes as early as 800, and the first church was built around 1040...

, Norway

Norway

Norway , officially the Kingdom of Norway, is a Nordic unitary constitutional monarchy whose territory comprises the western portion of the Scandinavian Peninsula, Jan Mayen, and the Arctic archipelago of Svalbard and Bouvet Island. Norway has a total area of and a population of about 4.9 million...

. It operates 23 vessels, with additional 17 newbuildings. The fleet includes platform supply vessel

Platform supply vessel

A Platform supply vessel is a ship specially designed to supply offshore oil platforms. These ships range from 20 to 100 meters in length and accomplish a variety of tasks...

s, anchor handling tug supply vessel

Anchor handling tug supply vessel

Anchor Handling Tug Supply vessels are mainly built to handle anchors for oil rigs, tow them to location, anchor them up and, in a few cases, serve as an Emergency Rescue and Recovery Vessel ....

s, multipurpose field- and ROV support vessels, well stimulation vessels, scientific core drilling vessels and crew vessels. In addition the subsidiary Siem Consub operates 10 vessels in Brazil

Brazil

Brazil , officially the Federative Republic of Brazil , is the largest country in South America. It is the world's fifth largest country, both by geographical area and by population with over 192 million people...

. Siem Industries (38%) and Rovde Invest (19%) are the largest owners.

History

The company was founded on 1 July 2005 as a spinn-off from Subsea 7

Subsea 7

Subsea 7 S.A. is a subsea engineering and construction company. Registered in Luxembourg and with its headquarters in London in the United Kingdom, the firm assumed its current form in January 2011 when Acergy S.A...

. In September the same year it bought Rovde Shipping and has since ordered a substantial number of new vessels, primarily platform supply vessels.