III. Symphonies in the Sky: How Alien Steam Zeppelins Changed the Sound of TravelGone are the days of the quiet hum from engines as travelers take flight. Alien steam zeppelins have taken over the skies and with them, comes a new symphony of sound. The hissing of steam mixed with the whir of gears provides a mechanical orchestra for passengers to enjoy. Its all part of the experience of travel in a world where bioengineering and steam power collide.