A literature survey and analysis of existing experimental data on cryogenic hydrogen combustion has been done. It includes different phenomena associated with accident scenarios involving LH2 as a fuel and ambient air as an oxidizer. The phenomena include LH2 jet fire behaviour, its scaling and radiation properties; burning LH2 pool behaviour, radiation characteristics; cryogenic hydrogen combustion in a layer geometry relevant to flame spread over the spill of LH2; flame acceleration and deflagration-detonation-transition for cryogenic hydrogen-air clouds in an enclosure; LH2 combustion in an enclosure. BLEVE processes are not included in the analysis because of the planned contribution from SH2IFT project. Major characteristics of combustion characteristics are evaluated from existing experimental data or extrapolated and theoretically predicted in cases of the lack of data. The knowledge gaps for different phenomena are defined and the main tasks for the forthcoming experiments are formulated.