Allseas Group S.A. is a Dutch offshore contractor specialising in pipelay, heavy lift and subsea construction.

The company spent its early days developing the concept of dynamically positioned (DP) subsea pipelay.

Allseas acquired the former bulk carrier Natalie Bolten in 1985 and converted it for DP pipelay at the Boele shipyard in Bolnes, the Netherlands.

[6] Lorelay immediately entered service and successfully executed her first pipelay contract, the 8-inch, 1.8-km Helder A-B pipeline, for Unocal in the Dutch sector of the North Sea.

[9][10] In 2018, Allseas announced its intention to build an even larger version of Pioneering Spirit, named Amazing Grace, which is scheduled to be delivered in 2022.