Antonini Navi enters the market with authority. The Seamore 34 is a 33.5-metre steel crossover yacht, the yard’s first delivery and a statement of intent from a builder with seven decades of metalworking heritage in La Spezia. Hydro Tec shaped the hull and exterior, combining a displacement profile with a soft bow and broad beam that yield generous interior volume under 300 GT. Hot Lab took the interiors, layering warm materials across five decks of usable space designed for long-range cruising with 10 guests and a crew of six.nnThe crossover concept bridges traditional superyacht comfort with explorer-grade capability. A shallow 2.4-metre loaded draft opens anchorages that deeper-hulled yachts cannot reach, while CMC stabilisers and a bow thruster ensure composed handling in open water. Steel construction delivers the structural rigidity and quietness that aluminium and composite builds cannot match at this scale.nnKeel laying took place in March 2024, with hull and superstructure joining completed by December of that year. Antonini Navi launched the yacht in March 2026 and delivered her to the owner in July, a build timeline that reflects the yard’s focused workflow and direct client involvement under its Blue Mile Protocol. For buyers seeking a fully custom steel yacht from a boutique Italian yard with serious industrial roots, the Seamore 34 sets the benchmark for what Antonini Navi intends to build next.
Length
33.5M
Beam
7.8M
Draft
2.4M
Volume
299GT
Day Guests
10
Sleeping
10
Cabin
5
Crew
6
Cruise Speed
12KT
Max Speed
13KT
Fuel
42000L
Range
4300NM
Engine
2 x CAT C18 725HP
Naval
Hydro Tec
Exterior
Hydro Tec
Interior
Hot Lab
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A maximum speed of 13 knots and cruising speed of 12 knots confirm the Seamore 34’s displacement character, built for distance rather than sprinting. Her economical speed of 10 knots extends range significantly, making her well-suited to transatlantic crossings and extended Mediterranean seasons without frequent fuel stops. Steel construction contributes to a smooth, quiet ride at sea, absorbing vibration more effectively than lighter composite or aluminium alternatives. Twin CMC stabilisers maintain comfort in beam seas, while a 55 kW CMC bow thruster provides precise manoeuvring in tight harbours and at anchor. The full-load draught of 2.4 metres strikes a practical balance, deep enough for seakeeping stability yet shallow enough to access anchorages that exclude deeper-drafted yachts of similar length.
Hydro Tec shaped the Seamore 34 around a crossover philosophy, blending explorer proportions with cleaner superyacht lines. The profile reads as purposeful without being aggressive: a raised bow, a long waterline, and a broad 7.8-metre beam that maximises volume across multiple deck levels. Deck areas flow logically from a sheltered aft cockpit forward to open sun decks, with the steel superstructure allowing larger window apertures than comparable explorer builds. The overall silhouette avoids the boxy proportions common to expedition yachts at this length, suggesting a yacht equally at home in Monaco as in Norwegian fjords. Tender storage and toy deployment have been integrated without compromising the clean profile that Hydro Tec is known for.
Hot Lab’s interior design accommodates 10 guests across five cabins, with a full-beam master suite as the centrepiece. The studio’s signature approach, warm natural materials paired with understated contemporary detailing, runs through every living space. Under-300-GT classification means the layout has been carefully calibrated to deliver maximum livability within regulatory volume constraints. The beam of 7.8 metres provides generous cabin widths across all decks, and natural light enters through large hull windows and deck-level glazing. Crew quarters for six are fully separated from guest areas, ensuring discreet service. As a full-custom build, every material choice, layout configuration, and finish was specified to the owner’s brief, making this first Seamore 34 a one-of-one expression of Antonini Navi’s capability.
The crossover concept delivers social spaces that rival yachts considerably larger. Multiple outdoor living zones span the aft deck, upper deck, and sun deck, creating distinct areas for formal dining, relaxed entertaining, and sunbathing. The main salon connects seamlessly to the aft cockpit, extending the social footprint when doors are opened in fair weather. A dedicated galley operates independently of the dining flow, allowing the crew to service meals without crossing guest circulation paths. The bridge deck offers a secondary lounge or owner’s retreat depending on the chosen configuration. For a yacht under 300 GT, the Seamore 34 packs in a remarkable number of distinct living zones, each with its own character and purpose.
Built entirely in steel at Antonini Navi’s La Spezia facility, the Seamore 34 benefits from the yard’s Blue Mile Protocol, a structured build process emphasising transparency and client involvement at every milestone. Keel laying in March 2024, hull joining in December 2024, launch in March 2026, and delivery in July 2026 represent a focused 28-month build cycle. Classification under 300 GT keeps regulatory and operational costs manageable while preserving the interior volume and performance of a significantly larger yacht. Dual CMC stabilisers and a single bow thruster complete the technical specification. For a buyer considering a new-build custom superyacht from a yard with serious industrial credentials and a demonstrable first delivery, the Seamore 34 offers a compelling proof of concept at a price point well below the major Italian yards.
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