In the future energy spectrum, hydrogen will play a key role in clean energy production. This session explores subsurface hydrogen storage and production, covering chemical and microbial controls, multiphase transport, and geomechanical integrity of caprock and porous media. Case studies highlight practical applications, while additional insights address mineral alteration and long-term geochemical dynamics. Presentations also feature innovative hydrogen production methods and pipeline leak detection, offering a comprehensive perspective on advancing hydrogen technologies for reliable and scalable subsurface energy systems.