1987
Allseas launched the Pieter Schelte concept; design based on two Very Large Crude Carriers (VLCCs)
1999
Excalibur Engineering was founded to further develop the Pieter Schelte concept
2004
New-build design, lengthened to 360 m
2007
Portals replaced by tilting lift beams
2008
Lengthened to 382 m
