"Good day, gentlemen. This is a pre-recorded briefing made prior to your departure and which, for security reasons of the highest importance, has been known on board during the mission only by your H-A-L 9000 computer. Now that you are in Jupiter space and the entire crew is revived, it can be told to you. Eighteen months ago, the first evidence of intelligent life off the Earth was discovered. It was buried forty feet below the lunar surface, near the crater Tycho. Except for a single, very powerful radio emission aimed at Jupiter, the four million-year-old black monolith has remained completely inert, its origin and purpose still a total mystery."