A worldwide classified project thought to be sponsored by Aerion Technologies and run by a number of other companies. Little is known about the project itself, but as the name states, it is most likely something big. The word "Behemoth" is considered the plural form of בהמה (bəhēmāh), meaning beast or large animal. It thus indicates that Behemoth is a large and powerful animal. Metaphorically, the name has come to be used for any extremely large or powerful entity, in this case the Project.
The only accessible website concerning Project Behemoth is no longer active. It's a danish hosted website, nothing else is known.
Numerous of different companies participate in the project.