The Danish rig contractor, which this week christened two newbuild drillships at the Geoje yard of Samsung Heavy Industries, was due to take delivery of the first unit, Maersk Viking, at the end of last year ready to start work for ExxonMobil in the Gulf of Mexico in the first quarter of 2014.

However, a Maersk spokesman said delivery of all four units ordered at the yard at a total cost of $2.6