Australian scientists test world-first underwater 3D concrete printing

Australian researchers at the University of Wollongong (UOW), in collaboration with Melbourne-based LUYTEN 3D, have developed the world’s first underwater 3D concrete printing system that builds stable structures without the use of chemical accelerators or additives. Their innovation centers on a single-mix concrete formulation engineered to set underwater through material design alone, eliminating the need for multi-stage mixes or rapid-setting chemicals typically required to prevent washout in underwater construction. Trials demonstrated that this single-mix solution maintains structural integrity and is practically viable for real-world applications, simplifying underwater construction logistics. This breakthrough technology marks a significant advancement in marine infrastructure construction, with immediate applications in defense, ports, coastal infrastructure, and emerging sectors such as the AUKUS submarine program and floating offshore wind farm anchors. LUYTEN 3D’s CEO emphasized that underwater 3D printing fundamentally changes construction and manufacturing by enabling resilient infrastructure development beneath the water’s surface. The project also highlights the expertise at UOW and reflects