As it was reported recently in Nature Hydrogen sulphide conducts electricity with zero resistance at a record high temperature of 203 K. Authors of this high profile discovery find that when they subject samples of hydrogen sulphide to extremely high pressures 150 GPs in diamond anvil cells and cool them below 203 K, the samples display the classic hallmarks of superconductivity: zero electrical resistance and Meissner effect. Results of these experiments suggest that hydrogen sulphide seems to be a 'conventional' type one superconductor. Authors also argue that the phase responsible for high-Tc superconductivity in this system is likely to be H3S, formed from H2S by decomposition under pressure. Today the structure of H2S at high pressure and cryogenic temperatures is little-known. We propose diffraction measurements of D2S at high pressure up to 20 GPa and temperature range 120 – 300 K