Source: Wiki
This is thought to be the end of Forerunners, however after the Covenant-Human war a UNSC ship records a conversation with a Forerunner Monitor. During this conversation the Monitor states that he was once a human named Chakas, who had survived the Halo event, and that there were many Arks built. At the the end of this conversation the Monitor takes control of the Human ship and takes it to one of the Arks. It is presumed to be Master Ark where the Didact along with other Forerunners are located.
Also he talks about a guy named ‘‘Chakas’’, I don’t know if I’m right but I remember that name from some one back in the Ancient Human Civilization? :o