Allseas
Allseas is a privately held offshore engineering contractor specializing in subsea pipelay, heavy lift, offshore structure installation and decommissioning.
Last updated August 31, 2026
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Overview
Allseas Group S.A. is a privately held offshore engineering and construction contractor founded in 1985 by Edward Heerema. The company specializes in the engineering, project management, transportation, installation and removal of offshore energy infrastructure. Its principal capabilities include subsea pipeline installation, heavy lifting, offshore platform installation, subsea construction and the decommissioning of offshore facilities. Allseas developed from an early focus on dynamically positioned pipelay. Its first vessel, Lorelay, entered service in 1986 and was designed to operate with full dynamic positioning, reducing reliance on anchors during pipeline installation. The company subsequently built and acquired a specialized fleet of pipelay, heavy-lift and subsea construction vessels. It has installed more than 30,000 kilometres of subsea pipeline worldwide using S-lay technology, with project pipeline diameters ranging from 2 to 48 inches. The company’s best-known asset is Pioneering Spirit, a very large construction vessel designed for the single-lift installation and removal of offshore platform topsides and for heavy subsea and pipeline work. The vessel represents Allseas’ strategy of developing proprietary ships and installation systems for projects that require exceptional lifting capacity, dimensional scale and marine-operational precision. Allseas also operates other specialized vessels for pipelay and subsea construction. Allseas Engineering B.V., based in the Netherlands, provides engineering and project-management support to the group and maintains offices in Delft, Eindhoven and Enschede. Allseas also has project and engineering operations in several international offshore markets. Although the company is headquartered in Switzerland and has Dutch engineering roots, its work is conducted internationally for offshore energy developers, operators and infrastructure contractors. The business has historically been associated with oil and gas infrastructure, but its technical development has broadened into offshore decommissioning, deep-sea resource-recovery systems and prospective nuclear technology for offshore vessels and industrial clusters. Allseas has investigated the recovery of polymetallic nodules from the deep ocean and announced a small modular reactor development plan in 2025. It remains privately owned, so detailed financial information and public-market valuation data are not generally available.
History
Allseas was founded in January 1985 by Edward Heerema, whose family had longstanding ties to the offshore construction industry. The company opened offices in the Netherlands and later established its headquarters in Châtel-Saint-Denis, Switzerland. Its early technical focus was dynamically positioned subsea pipelay, a method intended to allow a construction vessel to maintain its position through propulsion and control systems rather than conventional anchoring alone. In 1985, Allseas acquired the former bulk carrier Natalie Bolten and converted it for dynamically positioned pipelay at the Boele shipyard in Bolnes, the Netherlands. Renamed Lorelay, the vessel was christened in Rotterdam on 26 April 1986. It became the first Allseas vessel and entered service soon afterward. Its first reported pipelay contract involved the 8-inch, 1.8-kilometre Helder A-B pipeline for Unocal in the Dutch sector of the North Sea. Allseas expanded by developing a fleet of specialized pipelay, heavy-lift and subsea construction vessels. The company’s work grew beyond pipeline installation to include the transportation, installation, removal and decommissioning of offshore platforms and other large structures. Its S-lay operations have covered more than 30,000 kilometres of subsea pipeline worldwide, with pipeline diameters ranging from 2 to 48 inches. In 2007, Allseas announced plans for a twin-hulled vessel intended to install and remove large platform topsides and foundations while also supporting pipelay work. The vessel was planned at approximately 382 metres long and 124 metres wide, making it one of the largest ships ever conceived for offshore construction. It was initially named Pieter Schelte after Pieter Schelte Heerema, Edward Heerema’s father. The proposed name generated opposition because of Pieter Schelte Heerema’s wartime service with the Waffen-SS and his postwar imprisonment. In February 2015, Allseas announced that the vessel would instead be named Pioneering Spirit. Pioneering Spirit became the central symbol of Allseas’ heavy-lift strategy. Its design enables the single-lift installation and removal of large offshore platform topsides and supports major pipeline and subsea construction operations. The vessel broadened the scale at which Allseas could compete for offshore installation and decommissioning projects. The company also faced a major legal and reputational issue when a criminal trial in the United Kingdom in 2016 revealed that Allseas had been the victim of a multimillion-pound fraud. In 2011, the company reportedly invested £73 million with investors led by Luis Nobre, who claimed links to the Vatican and Spanish nobility. The available reference material identifies Allseas as the victim rather than the perpetrator. In 2018, Allseas announced plans for an even larger vessel, Amazing Grace, intended to extend the capabilities pioneered by Pioneering Spirit. The company suspended that project indefinitely in July 2020. Allseas has nevertheless continued to explore new applications for its marine engineering capabilities. In 2022, it conducted a pilot to recover polymetallic nodules from the seabed at approximately 4,500 metres depth, collecting about 4,500 tonnes. In 2025, it announced a small modular reactor development plan aimed at offshore vessels and onshore industrial clusters, with a target of starting first-unit production in 2030. Allseas Engineering B.V. in the Netherlands provides engineering and project-management services to the group, with offices in Delft, Eindhoven and Enschede. The wider organization maintains international project and engineering operations. Allseas remains privately held, and public information about the company is concentrated on its technology, fleet and projects rather than financial reporting.
- 2025
Small modular reactor plan announced
[1]Allseas announced a development plan for an SMR designed for offshore vessels and onshore industrial clusters.
- 2022
Polymetallic nodule recovery pilot
[1]The company conducted a pilot recovery operation at approximately 4,500 metres depth and reported collecting about 4,500 tonnes of nodules.
- 2020
Amazing Grace project suspended
[1]Allseas announced that development of Amazing Grace would be suspended indefinitely.
- 2018
Amazing Grace project announced
[1]Allseas announced plans for a larger vessel intended to extend the heavy-lift and offshore installation model of Pioneering Spirit.
- 2016
Pioneering Spirit entered commercial operation
[3]Pioneering Spirit became an operating asset for large offshore platform installation, removal and related construction work.
- 2015
Pieter Schelte renamed Pioneering Spirit
[1]The company changed the planned name of its large installation vessel following controversy over the original name.
- 2007
Large twin-hulled installation vessel announced
[1]Allseas announced plans for a very large twin-hulled vessel for platform installation, removal and pipelay.
- 1986
Lorelay entered service
[1]The converted vessel Lorelay was christened in Rotterdam and became Allseas' first pipelay vessel.
- 1985
Allseas founded
[1]Edward Heerema founded Allseas in January 1985, initially focusing on dynamically positioned subsea pipelay and related offshore engineering.
- 1985
Natalie Bolten acquired for conversion
[1]Allseas acquired the former bulk carrier Natalie Bolten and began converting it into a dynamically positioned pipelay vessel.
Products and positioning
A specialized, technology-led contractor for large and technically complex offshore energy and marine infrastructure projects.
Offshore construction vessel · 2016
Pioneering Spirit
A very large twin-hulled offshore construction vessel designed for the single-lift installation and removal of platform topsides and foundations. It also supports heavy subsea construction and pipeline work. The vessel is the principal expression of Allseas' large-scale installation technology.
Pipelay vessel · 1986
Lorelay
Allseas' first vessel, converted from the bulk carrier Natalie Bolten. Lorelay was designed for full dynamic positioning and entered service in 1986, establishing the company's early specialization in dynamically positioned subsea pipeline installation.
Engineering service
Subsea pipeline installation
Allseas installs subsea pipelines using specialized vessels and S-lay technology. Its reported project experience covers more than 30,000 kilometres of pipeline worldwide and a broad range of pipeline diameters.
Marine construction service
Offshore platform installation and removal
The company transports, installs and removes large offshore platform topsides, foundations and related structures. Its methods include heavy-lift and single-lift operations enabled by dedicated vessels and proprietary installation systems.
Engineering service
Subsea construction and decommissioning
Allseas provides subsea construction and offshore facility removal services, including technically demanding decommissioning work as offshore energy infrastructure reaches the end of its operating life.
Deep-sea technology · 2022
Polymetallic nodule recovery systems
Allseas is developing systems for recovering polymetallic nodules from the ocean floor. A 2022 pilot demonstrated collection at approximately 4,500 metres water depth.
Nuclear energy technology · 2025
Small modular reactor program
Announced in 2025, this program is intended to develop a small modular reactor tailored to offshore vessels and onshore industrial clusters. Allseas stated an objective of beginning first-unit production in 2030.
Controversies
2016
Investment fraud involving Allseas
A United Kingdom criminal trial revealed that Allseas had been the victim of a reported £73 million fraud connected with an investment made in 2011. The investors were led by Luis Nobre, who claimed links to the Vatican and Spanish nobility.
2015
Controversy over the Pieter Schelte vessel name
The planned name of Allseas' large platform installation vessel drew objections from politicians and Jewish groups because it commemorated Pieter Schelte Heerema's wartime service with the Waffen-SS and his postwar imprisonment. Allseas changed the name to Pioneering Spirit in 2015.
Brand decisions
2025
Announce offshore small modular reactor planProduct launchBackground
Allseas expanded its technology-development agenda toward nuclear power applications for marine and industrial settings.
Action taken
The company announced a plan to develop an SMR tailored for offshore vessels and onshore industrial clusters.
Aftermath
Allseas stated an objective of beginning production of the first SMR in 2030; the available material does not confirm deployment or regulatory approval.
2022
Pilot polymetallic nodule recoveryProduct launchBackground
Allseas investigated the application of its marine engineering capabilities to deep-sea resource recovery.
Action taken
The company conducted a pilot that collected approximately 4,500 tonnes of nodules from about 4,500 metres depth.
Aftermath
The pilot demonstrated a development direction beyond conventional offshore oil and gas construction, although the available material does not establish commercial-scale deployment.
2020
Suspend Amazing Grace developmentStrategyBackground
The planned larger successor to Pioneering Spirit had been announced in 2018 but was not taken forward on its original timetable.
Action taken
Allseas suspended the Amazing Grace project indefinitely.
Aftermath
Pioneering Spirit remained the company's principal ultra-large offshore installation platform in the available reference material.
2018
Announce the Amazing Grace vesselProduct launchBackground
Allseas sought to extend the scale and capability of the Pioneering Spirit heavy-lift concept.
Action taken
The company announced plans to build a larger vessel named Amazing Grace.
Aftermath
The project was suspended indefinitely in July 2020.
2015
Rename the large installation vesselStrategyBackground
The vessel's original planned name, Pieter Schelte, generated public controversy because of its association with the wartime history of Pieter Schelte Heerema.
Action taken
Allseas renamed the vessel Pioneering Spirit.
Aftermath
The renamed vessel became the company's flagship heavy-lift and offshore installation asset.
Recent events
- 2025
Allseas announced a small modular reactor development plan[1]
Product launch
Allseas announced plans to develop a small modular reactor intended for offshore vessels and onshore industrial clusters, with a stated goal of beginning production of the first unit in 2030.
- 2022
Allseas conducted a deep-sea polymetallic nodule recovery pilot[1]
Product launch · Other
The company reported a pilot operation that collected approximately 4,500 tonnes of polymetallic nodules at a depth of about 4,500 metres.
- 2020
Amazing Grace project suspended indefinitely[1]
Other
Allseas announced that development of the proposed Amazing Grace vessel would be suspended indefinitely.
- 2018
Allseas announced a larger successor to Pioneering Spirit[1]
Product launch
The company announced plans for a still larger platform installation and decommissioning vessel named Amazing Grace.
- 2015
Pioneering Spirit was renamed after controversy over its original proposed name[1]
Other
Allseas changed the planned name of its large platform installation vessel from Pieter Schelte to Pioneering Spirit after objections connected with Pieter Schelte Heerema's wartime history.
Sources4 sources
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