Allseas Group

Allseas Group

Allseas Group was founded by Edward Heerema, who built it into a dominant subsea pipeline installation and platform removal contractor. The firm operates an owned fleet of specialized vessels, including the 382-meter-long Pioneering Spirit, designed for single-lift removal of offshore platforms weighing up to 48,000 tons. Wealth originates from decades of offshore energy contracting. The firm's strategy covers pipelay for natural gas, oil, and carbon capture systems, platform decommissioning and transport, and polymetallic nodule collection from the ocean floor. It also pursues nuclear power for offshore vessels and onshore industrial use. Geographic footprint spans the North Sea, Gulf of Mexico, West Africa, Asia-Pacific, and the Middle East. Confirmed projects include the Yongan–Tongxiao 2 (YT2) milestone (per Allseas website). Allseas employs a team of engineers, project managers, and offshore specialists, with additional offices in Denmark and Switzerland. The firm maintains a wholly-owned fleet of advanced vessels, including the Lorelay pipelay barge, which marked 40 years of operations in a recent milestone. In 2025, the firm launched a new cargo barge named Braveheart for Rotterdam operations (per Allseas announcement). A structural differentiator is the firm's ownership of the largest construction vessel in the world, Pioneering Spirit, which allows single-lift platform removal — a unique capability in the offshore decommissioning market. The Heerema family's ownership model gives the firm a long-term investment horizon aligned with energy transition infrastructure, separating it from publicly traded contractors.