Breakthrough, also known as Project 821, is the largest yacht attending the 2025 Monaco Yacht Show and has sparked immense anticipation. Powered by liquid hydrogen and a next-generation fuel cell system, this 119-meter flagship is rewriting the norms of modern yacht building. The yacht's 3.2mW fuel cell system, running on cryogenic liquid hydrogen stored at -253°C, generates emission-free electricity, marking a significant leap in eco-friendly marine technology. Breakthrough's hybrid setup allows for a seamless switch between hydrogen fuel cells and conventional power, reducing emissions during hotel load phases. Additionally, the yacht boasts a voluminous sculptural presence with over 20 balconies and openings, setting new standards for both luxury and functionality. Designed as a private retreat by the sea, Breakthrough features a warm, coastal atmosphere with luxurious amenities like a semi-submerged Neptune lounge, contraflow pool, cinema, and a basketball court. Edmiston has listed Breakthrough for sale, describing it as 'the most extraordinary yacht ever built.' The yacht's innovative cryogenic storage system and impeccable design make it a standout in the industry, combining sustainability with opulence. Breakthrough's presence at the yacht show is expected to redefine what's possible in terms of marine engineering and luxury living.