Here is a commercial example of underground hydrogen storage that has been in service since 2007. It is a salt cavern in Texas. It is part of extensive hydrogen

Here is a commercial example of underground hydrogen storage that has been in service since 2007. It is a salt cavern in Texas. It is part of extensive hydrogen infrastructure connecting many industrial users (600 miles of pipeline) https://investors.linde.com/archive/praxair/news/2007/praxair-commercializes-industrys-only-hydrogen-storage https://investors.linde.com/archive/praxair/news/2007/praxai...