ABS green-lights Japanese autonomous rocket landing platform vessel design

Mitsui OSK Lines (MOL), Innovative Space Carrier (ISC), and Tsuneishi Solutions Tokyobay (T-SOL) have received approval in principle (AiP) from ABS for the basic design of an unmanned, autonomous offshore rocket recovery platform.

The key regulatory nod confirms the safety and technical feasibility of the system, which encompasses a main rocket recovery vessel, an offshore support vessel, and an onshore control centre.

The Houston-based class society said the innovative barge design is configured for offshore recovery operations and supports the return of reusable launch vehicles to Earth, a move set to slash launch costs and increase flight frequency. The shift to unmanned operations and autonomous technology also removes the need for personnel to be physically present, making recovery missions inherently safer.

The design reviews were conducted against the first international requirements for offshore spaceports, published by ABS in May 2023.

MOL, ISC, and T-SOL formed a partnership in July 2025 to develop and explore the commercialisation of offshore rocket launch-and-recovery vessels, building on their collective experience in shipping, shipbuilding, and engineering.

With offshore rocket operations already established globally, Japan’s swift commercialisation of this technology represents a strategic imperative. By harnessing the country’s unique geography, ISC plans to provide high-frequency space transportation from 2028 via its Asca 1 series of reusable launch vehicles.

Moving forward, the Japanese partners will continue working together while receiving technical guidance from ABS to further refine the design and advance studies towards practical implementation.