IIRC, the US navy had 2 rigid airships in the 30ies, Akron and Macon (both filled with Helium). Both crashed after a few years in service, in weather related a

IIRC, the US navy had 2 rigid airships in the 30ies, Akron and Macon (both filled with Helium). Both crashed after a few years in service, in weather related accidents (with significant loss of lives in Akron case). These two examples are not isolated cases, several zeppelin crashed in similar circumstances. Replacing H with He solves part of the safety issues with zeppelin, but not the main source of accidents. Given how high the susceptible to weather is, due to the inherent size an light weight of zeppelins, I don't think we will see a large zeppelin being built in the foreseeable future, despite all the projects around these.