What the heck is the Sea Org? It sounds like a creature from a Conan movie.
Originally it was made up of Hubbard's most trusted aids who were with him on the scientology home base, which due to legal problems was on board a private yacht, the Apollo. Since they were avoiding legal authorities they spend most of their time at sea - hence the Sea Org[anization].
Later in an excess of corporate loyalty the members decided that a lifetime contract was just soooooo wog that they created a one billion year contract.
Hubbard was said to be a bit freaked out by this, but quickly realized these were True Believers he could use.