[T.B. Yoits]

University of New South Wales Professor Shawn Kook must have gotten well paid for this "research".

The issue isn't about getting an engine, any engine, to run on hydrogen. The issue is about transporting hydrogen in a stable enough medium before burning it... like maybe in a hydrocarbon chain called petrol, diesel, propane, gas, etc.

[Jonty30]

My understanding is that, if a hydrogen engine gets damaged in an accident, it will empty out immediately, leaving none of it to catch fire.