The Company traces its roots back to Det Søndenfjelds-Norske Dampskipselskap AS (DSND) which was established in 1854.  By early 1990, DSND had taken ownership of several dynamically positioned (DP) offshore vessels.

Between 1995 and 2002 the Company conducted a number of acquisitions of assets or businesses which gave it a significant position within the area of offshore maintenance and construction, both in terms of geography and resources.  The acquisitions provided DSND with the skills and equipment to complete total construction contracts for deepwater subsea installations, as well as the installation of pipelines, floating production units and riser systems, and link-up and completion of subsea production installations.

In late 2001, DSND announced that they were in discussions with Halliburton on combining their respective activities within subsea construction and related services.  On 23 May 2002 the two companies announced that they had completed a final agreement for the creation of the 50/50 joint venture company Subsea 7 Holding Inc. (formerly named Subsea 7 Inc.).

On 15 November 2004 the Company announced that it had entered into a heads of agreement with Halliburton Company to acquire the Halliburton Group's 50 percent share of Subsea 7 Holding Inc.  The transaction was completed in January 2005.

The Company was listed on the Oslo Stock Exchange in August 2005 (Ticker Code: SUB).

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