Sea1’s first offshore energy support vessel launches at Chinese yard

The first of four 120-meter-long offshore energy support vessels (OESVs) being built in China for Norwegian offshore services provider Sea1 Offshore has been launched at the yard.

Sea1 Offshore placed the order for the first two OESVs with Cosco Shipping in November 2024, revealing at the time that negotiations were ongoing for the delivery of more vessels. The contract for the construction of two additional vessels was announced in March 2025.

The construction of the first vessel, named Sea1 Diamond, began in September 2025, with the second, named Sea1 Citrine, following in December.

Sea1 Offshore reported yesterday, July 21, that Sea1 Diamond was launched at the yard, marking an important step forward in the newbuild program.

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