A groundbreaking initiative is underway to excavate vast salt caverns beneath Portland Harbour in Dorset, United Kingdom, to store hydrogen for bolstering the country's energy security. The project involves creating 19 caverns, each equivalent in size to St Paul’s Cathedral, to store enough hydrogen to power a station for multiple days during emergencies when renewable sources like wind and solar are insufficient. Endorsed by Energy Secretary Claire Coutinho, the scheme aims to secure taxpayer subsidies for hydrogen storage. UK Oil and Gas (UKOG) leads the project, planning to seek planning permission soon. The construction of caverns, utilizing the high-quality rock salt beneath the harbour, will contribute to the UK's energy resilience. Each cavern will be massive, 85 meters in diameter and 90 meters high, with a capacity twice that of St Paul’s Cathedral. The project signifies UKOG's shift from oil and gas to renewable energy, focusing on hydrogen storage, aligning with the nation's move towards sustainable energy sources. This strategic endeavor holds importance as the UK transitions towards cleaner energy, marking a significant milestone in energy security and sustainability.