Hydrogen is considered a key enabler of a net-zero emission energy system. It provides a balance between energy supply and demand over possibly long distances and periods of time and, thus, allows introduction of a higher share of renewable energy sources in the overall energy mix. Offering a balancing mechanism to the energy system will require large-scale storage of hydrogen, which can be most cost-effectively realized in the subsurface using mined salt caverns, depleted reservoirs, or aquifers. This webinar will provide an introduction to H2 subsurface storage technologies and highlight the critical role of the geosciences and petroleum engineering in their de-risking and further development. It will address performance characteristics, remaining challenges, suitable geological resources, and ongoing piloting activities and commercial-scale developments.