http://forum.kerbalspaceprogram.com/index.php?/topic/22008-021-hooligan-labs-airship-submarines-and-more/&page=1
While Hooligan Labs will no longer be working on KSP mods, we strongly encourage you to copy and expand upon the models and code. All Hooligan Labs KSP mods are shared according to the MIT License. You can do anything with the mod and its source code except hold Hooligan Labs liable. The Hooligan Labs logo is copyright 2013, but may continue to be used in KSP because KSP is awesome.
Just a copy form the original author page...
