Yet, millions of tons of H2 is produced, stored and transported annually, today. It needs adequate ventilation to ensure that any leakage doesn't accumulate to

Yet, millions of tons of H2 is produced, stored and transported annually, today. It needs adequate ventilation to ensure that any leakage doesn't accumulate to exceed a 25% mix with air. That is done where H2 is used now. You are not hearing about hydrogen detonations.