Learn more about Boundless - our brand new unique series of expedition ships fully equipped for both polar and warm water cruises.

The Story
Designed by SunStone with naval architecture completed by Danish naval architects OSK, the Boundless Class features a distinct inverted bow, best in class energy efficiency and environmental commitments.

Where luxury meets highest quality

The elegant and luxurious interior is designed by Steen Friis, Denmark, Tillberg Design USA, or designers of the charterer’s choice and built/installed by European interior contractors.

Furthermore, all technical equipment is delivered by well-known European suppliers.

Focus on safety, comfort and environment

The new Boundless Class is based on SunStone’s ethos, listing the following priorities:

Environmental Responsibility

Expedition cruising of tomorrow

Delivery of first Boundless vessel
expected: Q3 2026.

Length Overall:

125.00 M


21.00 M


5.20 M


13,000 GT


15 KN

PAX Cabins:




Boundless series will exceed industry expectations

Expedition cruises prioritize safety and the environment, which is crucial given that the remote locations they visit are often untouched by humans. To meet these high standards, operators must adhere to strict regulations set by both local and international authorities.

But that is not all - passengers also expect operators to reduce their environmental impact while providing a top-notch onboard experience. Despite the challenges, the Boundless Class goes above and beyond industry standards with cutting-edge technology and features like Polar Class (PC6), Safe Return to Port, and IMO Tier III engines.

Whether you are seeking adventure, relaxation, or a little bit of both, you can rest assured that SunStone is committed to providing a safe and luxurious experience that will not harm the environment.


Notable Features

Polar Class (PC6)
Safe Return to Port
Zero-speed stabilization
Diesel electric hybrid for better passenger comfort and energy optimization
High maneuverability with pods thrusters
Virtual Anchoring / Station keeping
Best in class energy efficiency
Enclosed maintenance and storage facilities for 20 Zodiac Mark V
Expedition staff cabins at PAX standard quality
Large std passenger cabins of 23 m2
Waste heat recovery
Inverted Bow
Future fuels ready
Optional battery pack

Key parameters

​Length Overall: 125.00 m
Length p.p.: 120.50 m
Beam: 21.00 m
Draft: 5.20 m

Tonnage (GT): Preliminary: 13,000
Speed: 15 knots

Pax Cabins: 100-130
Berths: 200-260
Crew Berth: 137