About the research project The seakeeping behaviour of surfaced underwater vehicles (UVs) is critical for their operational performance and safety, particularly in harsh sea conditions. Unlike fully submerged UVs, surfaced vehicles experience significant interactions with the air-sea interface, leading to challenges such as increased wave loads, instability, and resistance. Understanding these dynamics is essential for optimising vehicle design and ensuring mission success. The seakeeping performance of surfaced underwater vehicles (UVs) is influenced by unique hydrodynamic factors such as bow runup, aft control surface (ACS) effects, and complex non-linear interactions with waves. This research proposal builds upon previous findings that highlight the unique hydrodynamic characteristics of surfaced UVs and the limitations of existing testing methodologies traditionally designed for surface vessels. This research aims to leverage advanced numerical modelling techniques to deepen understanding of the seakeeping behaviour of surfaced UVs, focusing on their motion response, stability, and resistance under diverse operational conditions.