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Transocean said Tuesday that it has pushed back the delivery of five jackup rigs from a Keppel shipyard by about four years.

The Switzerland-based company reached a mutual agreement with Keppel Offshore & Marine Ltd’s shipyard Keppel FELS to defer the delivery and related payments of five high-specification jackups until 2020.

The rig order was placed in November 2013 and delivery was slated to begin in the first quarter of 2016 with the final rig due for delivery in the third quarter of 2017.

The combined capital cost for the five rigs is estimated at under $1.2 billion, excluding capitalized interest and other costs.

The jackups will be capable of operating in water depths up to 400 feet and constructing wells up to 35,000 feet, Transocean said when the deal was announced.

The rigs are designed to accommodate 150 personnel.

The Super B 400 Bigfoot Class jackup drilling rigs are now scheduled to be delivered in two and three month intervals beginning in the first quarter of 2020.

According to Rigzone, the five affected rigs are the Transocean Cassiopeia, Transocean Centaurus , Transocean Cepheus, Transocean Cetus  and Transocean Circinus.