I can't find a reference now, but as I understand it this isn't so much of an issue at low pressure. Apparently underground low pressure storage has been used

I can't find a reference now, but as I understand it this isn't so much of an issue at low pressure. Apparently underground low pressure storage has been used successfully: http://en.wikipedia.org/wiki/Hydrogen_storage#Underground_hydrogen_storage http://en.wikipedia.org/wiki/Hydrogen_storage#Underground_hy...