Hydrogen compression tanks from 5,000 pounds per square inch to 10,000 pounds per square inch have been certified worldwide according to ISO 11439(Europe). But for large scale hydrogen depot storage , hydrogen may be stored as a liquid. To liquify hydrogen requires refrigeration capabilities in the liquid nitrogen range. Another answer of course is to generate the hydrogen at the storage depot on an as needed basis. This alternative only requires large volumes of the raw materials .... electricity , water , and catalyst and compression engines to be available on demand. There are many independent companies researching these design problems at this time. N1R is dedicated to safe and ecologically secure storage depots.