This happened when an airship of mine lost lift, and became snagged on a floating suspendium island. The creaking sound effect added in the latest version started to endlessly loop.
The creaking effects are too loud.
Also, when the ship was eventually (forcibly) grounded, various creaking sound effects continued to play. If that isn't a bug, there's way too much creaking.
As soon as you fix the sound issues, you need to make a new trailer. The new explosions look incredible!