The SHIMMER project developed a modelling framework to assess the dispersion and dissolution of a bubble plume rising through the water column from an underwater gas leak. This approach is designed for multicomponent gases and forms a key part of a broader risk assessment for underwater gas releases. The study also outlines a general guideline for evaluating such risks. The methodology is applied to underwater releases involving hydrogen and hydrogen-natural gas blends. Findings indicate that the risk of fire, explosions, and increased hydrodynamic loads at the surface escalates with higher hydrogen content.
