The platform is apparently kept aloft by a large balloon...
...with the help of a number of industrious clanks wearing some sort of propulsion system.
Nearby is The Pipe, also owned by Mr. Araghi and floating high above the mainland.
Be the Human Cannonball if you dare, Dear Reader, but beware - you may find yourself several sims away when all is said and done.
Steampy the robot is on board the Snail to greet visitors, but he's remarkably taciturn.
Still, this is undeniable: