Strategic Marine wins order for two 33m Supa Swath CTVs from Mainprize Offshore

Delivery of the first two vessels is expected in Q3 2027.

Strategic Marine has signed a contract with Mainprize Offshore to build two 33-metre Supa Swath crew transfer vessels (CTVs), continuing a long-term partnership between the two companies.

The deal brings the total number of Supa Swath vessels delivered and on order to 10, reflecting Mainprize Offshore’s continued use of the design for offshore wind operations. The company currently operates 11 vessels.

The new 33m design, developed by Walker Marine Design, builds on the proven 26m Supa Swath platform with several key upgrades. These include an extended 30-metre waterline length, a wider 13-metre beam, and fuel oil capacity exceeding 63,800 litres, enabling longer operational endurance.

Passenger capacity has also been increased to 39 personnel, up from 27 on the earlier design, with upgraded premium seating to improve transit comfort.

The vessel also features 360-degree wheelhouse visibility for enhanced navigational safety, alongside a 140m² deck cargo area with a load capacity of up to 50 tonnes.

Powered by twin Caterpillar C32B engines and dual four-blade controllable pitch propellers, the vessels can reach speeds of up to 30 knots. The hull and propulsion design aims to improve fuel efficiency and reduce emissions while maintaining high-speed performance.

Mainprize Offshore said the Supa Swath design has delivered strong performance in stability, safety, and comfort, supporting continued investment in the platform.

Strategic Marine said the order reflects ongoing demand for high-performance, reliable offshore support vessels.

Delivery of the first two vessels is expected in Q3 2027.

Once delivered, Mainprize Offshore’s fleet will grow to 21 vessels, expanding its offshore wind support operations across Europe and Asia.