The realization of a spin liquid is a long-sought dream in condensed matter physics. The theoretical predication for Kitaev spin liquid in honeycomb iridates triggered tremendous interests. We discovered a new platform for Kitaev physics, beta-Li2IrO3 with a 3D analogue of honeycomb lattice dubbed hyperhoneycomb lattice. beta-Li2IrO3 in fact undergoes a magnetic ordering. Interestingly, an application of pressure drastically changes the magnetic properties of beta-Li2IrO3, indicating that its magnetic ground state is sensitive to lattice distortion. We therefore synthesized a new hyperhoneycomb iridate beta-H2IrO3 by an ion-exchange reaction to tune the lattice distortion. The magnetism of beta-H2IrO3 looks quite different from beta-Li2IrO3, but the details of structure are unknown. We plan to analyse such details with high resolution powder neutron diffraction measurements at HRPD.