Our field of expertise


Astra-G is the World’s first purpose-built seismographic research support vessel.

When Rederij Groen, a Scheveningen-based service supplier to the offshore industry, secured a long-term charter contract for two chase vessels for seismographic research, a strategic consideration was made which resulted in the decision to develop the world’s first purpose-built seismographic research support vessels.


It is our vision to design vessels with sustainability in mind. The preliminary design consisted of the hull lines, a general arrangement and a technical specification. The initial design brief called for a tonnage below 500GT, comfortable accommodation above the main deck, a practical aft working deck and a spacious wheelhouse with good views both forward and aft.


The design of the Astra-G and Aquarius-G was primarily based on her seakeeping behavior at low speed. Saltwater concluded that a sharp bow, with U-shaped sections and minimal bow flair, along with V-shaped stern sections would yield the best result. At low speeds stern slamming becomes an important issue, V-shaped stern frames help reduce the force of the impact.

Astra-G & Aquarius-G

The collaborative effort to design the perfect vessel exemplified the seamless blend of expertise and creativity of Saltwater, resulting in the Astra-G, a ship that meets all our expectations.

Erik Groen | Operations Manager

Specific project data

Project information


  • Design of a purpose built chase vessel


  • Basic design
  • Class approval package
  • Detailed engineering
Astra-G & Aquarius-G
Astra-G & Aquarius-G
Astra-G & Aquarius-G
Astra-G & Aquarius-G
Astra-G & Aquarius-G
Astra-G & Aquarius-G