German shipyard Lürssen has shared new images of its latest superyacht project, O3 (ex Project Shackleton), on sea trials. The builder also confirmed her length to be 109 metres.
The project, which has been under construction since 2018, has remained highly secretive throughout its build. She was photographed en route to sea trials by yacht spotters at the end of last month, in what marked her first appearance away from the German facilities since 2022.
Delivery is expected in Q1 of 2026, according to BOATPro, following almost eight years of construction.
The build was originally sold in March 2018 by Moran Yacht & Ship, though she was reported to have sold again during construction in 2022. Following the second aforementioned sale, she was extended in length for several exterior design modifications, including the addition of a large helideck.
Prior to sea trials, the mammoth build was last spotted leaving the dock in 2022 at the German yard's Peene-Werft facilities in northeastern Germany, showcasing her grey axe-style bow and white superstructure that sits well forward - originally from the drawing boards of Norwegian studio Salt Ship Design.
She was transported to one of Lürssen's floating drydocks in Hamburg, where the additional modifications and outfitting were completed. Her new designers are yet to be confirmed.
Curated for exploration, the 109-metre has been built with an ice-classed hull, cargo-carrying capacity and a heli-hangar on her original spec sheet. Steel and aluminium comprise the build, which is expected to feature a total volume of more than 6,000GT and accommodation for up to 20 guests.
Previously, Moran Yacht & Ship revealed that the build will be powered by a diesel-electric propulsion system and feature state-of-the-art energy-saving, power storage, heating and cooling systems.
Once delivered, O3 will become one of the world's largest superyachts. The superyacht joins 10 other yachts measuring over 100 metres currently under construction at Lürssen, the largest of which is the 146.2-metre Project Defy.
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