Bottoms NOT up! World’s LONGEST aircraft Airlander 10 – dubbed The Flying Bum – crashes in a field sparking fears of helium gas and fuel leaks
Helium’s entirely inert. Plus, very light indeed, meaning that nanoseconds after a leak it’s dispersed hundreds of metres up into the atmosphere. A helium leak or release, as long as you’re not in an enclosed room, is perhaps the least worrying thing ever.