The diesel-electric superyacht signals a new design philosophy centered on efficiency, practicality, and people-focused living.
Purpose at the Core of Design
Launched from Oceanco’s Alblasserdam facility on 10 August, the 4,999-GT Leviathan represents the shipyard’s most ambitious build to date. Reportedly owned by Oceanco shareholder Gabe Newell, the project reflects his emphasis on functionality and crew wellbeing. The diesel-electric propulsion and reimagined interior layout of the yacht redefine how space and systems can serve people rather than tradition.
Construction began in 2020, with the stern section transported to Oceanco’s Zwijndrecht site in 2022 before final outfitting in Alblasserdam. Designed by Oceanco with naval architecture from Lateral Naval Architects and interiors by Mark Berryman Design, Leviathan stretches 111 meters in length with a 17.8-meter beam, making her Oceanco’s largest yacht by gross tonnage.
Clean Lines, Low Maintenance
Oceanco’s exterior styling is minimalist and precise. The light-gray hull and superstructure are accented by a turquoise bootstripe and half-court marking that carry through the design. At night, programmable LEDs outline her decks in soft turquoise, giving the yacht a distinct profile while keeping visibility clear for deck operations.
Movement and maintenance were priorities. Wraparound walkways and expansive glazing create open sightlines, while the aft terraces cascade to a tri-fold beach club. Composite decks and capping rails replace teak and varnished timber, reducing upkeep and weight. Across the aft decks, a subtle layered-gray pattern mirrors circuit geometry, connecting each terrace visually and emphasizing balance over ornamentation.
Spaces Designed Around People
Mark Berryman Design’s interiors follow the same philosophy of practicality with warmth. Finishes such as honed stone, brushed metal, and natural wool were chosen for durability and understated quality. Crew insight shaped much of the specification, from material selection to service routes, aligning comfort with operational efficiency.
The layout of the motor yacht introduces flexible shared zones between guests and crew, such as collaborative dining areas that can shift between private and communal use. A striking detail runs through the main staircase: a glass panel etched with the names of more than 2,000 individuals involved in the build, celebrating the teamwork that brought Leviathan to life.
Leviathan accommodates 22 guests across 11 suites, with quarters for 33 crew. Crew areas include gyms and wellness spaces, reflecting the owner’s belief that morale and rest directly influence service and safety. Circulation has been designed for smooth, discreet movement throughout, supporting both privacy and efficiency on board.
Diesel-Electric Efficiency at Scale
Power comes from a diesel-electric system supported by a large battery storage unit, enabling extended silent, emission-free running. The yacht also features waste-heat recovery and advanced wastewater treatment to meet high environmental standards.
For Oceanco, Leviathan marks more than a milestone in size. Project Director Deniz de Koningh described her as “a new philosophy of yachting, one that places greater purpose at the heart of design, ownership, and operations.” From her composite decks and tri-fold beach club to her hybrid propulsion and collaborative interior, every aspect supports that principle.
Now on sea trials off the Dutch coast, Leviathan demonstrates how technical innovation and human-centered design can coexist at scale. Upon delivery later this year, she will enter YachtBuyer’s YB100 ranking near Rank 38 by gross tonnage, securing her position among the world’s largest and most forward-thinking yachts.
Future Projects on Oceanco’s Horizon
According to YachtBuyer Market Watch, the world's largest yacht database, Oceanco is advancing three other full-custom builds that continue its large-yacht trajectory. This includes the 111-meter DreAMBoat - designed by Espen Øino with interiors by Mark Berryman, DreAMBoat is due for delivery in 2026. With a 4,550GT volume, the yacht features a winter garden, cinema, spa, and beach club, alongside an owner’s private deck with jacuzzi.
Further ahead, the 130-meter Oceanco Y727 represents the next step in scale, with an internal volume exceeding 11,000GT. The project was formally contracted with Lloyd’s Register at the 2025 Monaco Yacht Show, marking the continuation of a 38-year partnership between the two organizations. Early renderings suggest the design will incorporate extensive structural glass, a feature likely requiring careful classification to meet safety standards. Scheduled for completion in 2030, Y727 pushes Oceanco’s technical and architectural boundaries, reinforcing its commitment to ambitious, next-generation design.
Leviathan marks a defining moment for Oceanco, showcasing how advanced engineering and human-centered design can meet at superyacht scale. With future builds already underway, the shipyard’s creative and technical momentum shows no sign of slowing.
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