Forerunner Ship

Summary
There is a Forerunner ship used to power High Charity. When the Flood attack the city, the Prophet of Truth uncouples the ship from High Charity's power grid, and uses it to travel to Earth. The Forerunner ship travels vertically, like a rocket. It is also capable of slipstream travel.

At the end of Halo 2 Master Chief gets onboard this Forerunner Ship, in his mission to kill the Prophet of Truth.

Unknowingly Spartan 117(Master Chief)exits Slipstream space, near Earth.