Click the link and watch? It’s very good. Looks like Veritasium spent a huge amount of time researching for this video and you’re not just trusting his research - he interviews experts on historical (failed) air ships as well as modern engineers working on multi-billion dollar projects trying to fix the mistakes that were made in the past as well as discussing new problems that weren’t encountered last time but would have if they hadn’t given up almost immediately.

Still - it finishes on a positive note, those engineers do think the problems can be solved. We could have cheap cargo transport to anywhere in the world instead of exclusively to coastlines. That’s a problem worth solving.