Sea1 Offshore’s vessel joins Boskalis’ fleet following sale

The Netherlands-headquartered Boskalis has added a new construction support vessel (CSV) to its fleet, following the purchase from Norwegian vessel operator Sea1 Offshore, formerly known as Siem Offshore.

The 120-meter-long Spearfish CSV is equipped with a heave-compensated deck crane capable of lifting 250 tons and is designed for subsea operation duties such as construction and installation work, inspection and maintenance.

The vessel, of STX OSCV 03 design and accommodation for 110 persons, marks the third CSV to join Boskalis’ fleet in less than a year, following the BOKA Pioneer and the BOKA Pride.

To remind, Sea1 Offshore reported in mid-April that it had signed an agreement to sell the 2014-built vessel to “an independent third party”. The sale, done on market terms, was expected to result in a gain of approximately $40 million, with the existing debt of $39 million repaid following the transaction.

The Norwegian company has an order placed with Chinese shipyard Cosco Shipping for four next-generation offshore energy support vessels (OESVs). The first two were ordered at the end of 2024, with the following pair ordered this March.

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