We are at the dawn of a hydrogen economy. Both governments and industries are investing heavily on hydrogen. There is an increasing demand for substantial efforts to ensure the safe use of hydrogen as an energy carrier. In common with a new industry, there is also a pressing need to train young talents who will take on the challenges ahead in their proud stride to carry the industry forward. The proposal aims to offer a unique opportunity for researchers in the early stages of their careers to work in inter nationally recognised inter-disciplinary and multi-disciplinary research teams of scientists and engineers to acquire specific scientific skills and competencies in the diffusion, ignition and combustion of hydrogen within the context of fire and explosion safety. The principal output from HYFIRE will be the establishment for further development of a pool of EU trained researchers specialising in hydrogen fire and explosion safety, a relatively new field where such young talent is at present lacking. HYFIRE will focus on cutting edge research in the underpinning areas of hydrogen safety. In the mean time, we also aim to achieve several major breakthroughs. Systematic training will be provided through research and dedicated mini-schools and workshops in the f ollowing multidisciplinary and interconnected areas: 1.Hydrogen jet flames from very high-pressure release 2.Flame impinging on surfaces and the resulting effect on hydrogen transport cylinders and storage vessels 3.Liquid hydrogen spill and combustible cl oud dynamics 4.Hydrogen combustion in semi-confined and vented geometries and the conditions leading to the deflagration-to-detonation transition (DDT). The research will be conducted using CFD based numerical modelling approaches while the abundant publis hed experimental data from small- and large-scale tests will be used for model validation.