marine construction company. Shortly after his ascension, Cal Dive Intl. became a publicly traded company on the NASDAQ stock exchange. 2001 – Cal Dive Intl. purchases Professional Divers of New Orleans for $11.5 million and acquired 85 percent of outstanding Canyon Offshore shares, and purchased the remaining 15 percent over the next three years. With the acquisition of Canyon Offshore, Cal Dive Intl. could now offer operators ROV, intervention and cable/flowline burial services. 2002 – The world’s first deepsea well intervention semi-submersible, the Q4000, is launched into service in the Gulf of Mexico. 2006 – Following the acquisition of Helix RDS, a reservoir consultancy company, Cal Dive Intl. changed the corporate name to Helix Energy Solutions Group Inc. to better reflect the company’s double-stranded business model of offering contracting services while also maintaining a role as an independent oil and gas producer. The company also moved its stock listing from NASDAQ to the New York Stock Exchange under the new ticker symbol, HLX. 2008 – Newbuild well intervention vessel, Well Enhancer, is launched into service in the North Sea. 2010 – Helix ESG deploys multiple assets and resources to contain the 2010 Gulf of Mexico Oil Spill. 2012 – Helix ESG announces divestiture plans regarding its subsea construction business unit, Helix Subsea Construction, and the sale of its vessels. Helix ESG also announced that going forward well intervention and ROV services would be its primary contracting businesses and new vessels would be purchased or chartered to meet growing demand in those service sectors. 2015 – Helix Energy Solutions Group saw its profit tumble 78 percent in the fourth quarter as upstreams curb drilling activity. 2019 - Newbuild Q7000 well intervention semisubmersible vessel is delivered to Helix Energy Solutions Business units Helix ESG is divided into three business units: Well Intervention Provider of a range of well operation, subsea wireline and decommissioning services with specialist vessels and in-house developed equipment that includes the Subsea Intervention Lubricator and the Intervention Riser System. Well Ops’ assets include three purpose-built offshore units along with mobile equipment. Current assets include: Q4000 Q5000 Q7000 Siem Helix 1 Siem Helix 2 MSV Seawell MSV Well Enhancer Intervention Riser System (IRS), a tool used in subsea well intervention and subsea well containment. The IRS enables access to subsea well trees while isolating the wellbore pressure as downhole tools like wireline or coiled tubing are deployed or changed out.