Halo 3: The Cradle of Life
From Halopedia, the Halo wiki
Halo 3: The Cradle of Life is a short flash animation web comic, one of the first parts of the Iris campaign created for Halo 3. The comic and story were created by Ashley Wood with Bungie overseeing the story.
During the Iris campaign, the original comic could be found here, though as of the campaign's end in 2009 this link is now defunct. Halopedia hosts a backup copy of the original comic as it was originally presented, viewable here.
The Cradle of Life tells the story of an African tribesman, N'chala, who goes every morning to the same spot in the plains and watches something special. The comic implies that the "gods" are building a huge machine in a large lake on the plains of Africa.
On the last page of the comic, there are three panels. They are each able to be moved with the mouse to reveal certain numbers. When the numbers were arranged in order, they became an IP Address, 18.104.22.168, which led to a site called the Transmission Log. This site was part of the Alternate Reality Game, Iris.