This man on the pic above was the Russian scientist Tsiolkovsky. Some people in Russia call him the “father” of Russian space program. He also invented the hard-bodied dirigibles and published his works about such models right before foreign scientist Zeppelin, though the name of the later is more associated with dirigibles.
But what’s interesting is that some times later after the construction of those hard bodied aircrafts started, the Soviet state cut the financing and some of them were left unfinished. So Russian people have found another use for large steel “skeleton” frames of the dirigibles – they used them in the subway construction. For example these photos below are shots from one of the subway stations in Moscow. One can clearly see the remains of dirigible implanted in the metro station. If to use some imagination you can find yourself not deeply underground but high in skies, while waiting for the next train.