A high-tech airship is under construction in a Silicon Valley hangar, according to a recent report in the Guardian, and it will likely be more than 650 feet from nose to tail. “It’s going to be massive on a grand scale,” one source told the paper, though that would still be smaller than classic airships of the early 1900s. The Hindenburg, for example, stretched more than 800 feet long.
Source: avwebReport: World's Largest Airship In The Works