Allseas Group SA is one of the largest offshore pipelay companies with 2000 employees. The company is privately owned by founder Edward Heerema.

Founded in 1985, Allseas is headquartered in Châtel-Saint-Denis

Châtel-Saint-Denis

Châtel-Saint-Denis is a municipality and district capital of the district of Veveyse in the canton of Fribourg in Switzerland.The bog and Lac de Lussy are a nature preserve.-External links:* /...

, Switzerland

Switzerland

Switzerland name of one of the Swiss cantons. ; ; ; or ), in its full name the Swiss Confederation , is a federal republic consisting of 26 cantons, with Bern as the seat of the federal authorities. The country is situated in Western Europe,Or Central Europe depending on the definition....

, and has offices in The Netherlands, Belgium, USA, Australia, UK, Portugal and India.

Allseas operates three pipelay vessels (the Audacia, the Lorelay and the Solitaire

Solitaire

Solitaire is any tabletop game which one can play by oneself or with other people. The solitaire card game Klondike is often known as simply Solitaire....

), one support/trenching vessel (the Calamity Jane

Calamity Jane

Martha Jane Cannary Burke , better known as Calamity Jane, was an American frontierswoman, and professional scout best known for her claim of being an acquaintance of Wild Bill Hickok, but also for having gained fame fighting Native Americans...

), one survey ship (the Manta

Manta

Manta is a mid-sized city in Manabí Province, Ecuador. It is the second most populous city in the province, the fifth most populous in the country and, economically, the third most important city of Ecuador. Manta has existed since Pre-Columbian times. It was a trading post for the Mantas....

), and one pontoon

Pontoon (boat)

A pontoon is a flotation device with buoyancy sufficient to float itself as well as a heavy load. A pontoon boat is a flattish boat that relies on pontoons to float. Pontoons may be used on boats, rafts, barges, docks, floatplanes or seaplanes. Pontoons may support a platform, creating a raft. A...

 (the Tog Mor). Allseas in 2007 took the decision to build a new pipelay and offshore platform-removal ship Pieter Schelte

Pieter Schelte

Pieter Schelte is a planned platform installation/ decommissioning and pipelay vessel for the Allseas company, which when built will be the world's biggest. Allseas says the conceptual design of Pieter Schelte and the basic design of the novel twin hulls has been completed by Swan Hunter in...

, which is scheduled to enter service in 2012. At 382 metres (1,253 ft) in length and 117 metres (384 ft) in width, it will be the largest ship by area ever built.