The Artifact or The Portal, known to the scientific community as the Excession at Voi, is a Forerunner artifact in Kenya, Africa on planet Earth, designed to generate a slipspace portal to Installation 00.
It was buried between the town of Voi and the city of Mombasa, and uncovered by the Covenant during the Battle of Earth in late 2552.
According to the messages from a Forerunner known as The Librarian contained throughout the Terminals on the Ark, the artifact on Earth was the last of numerous gateways constructed throughout the galaxy, and was buried shortly before the activation of the Halo rings.
An ancient African elder named N'chala witnessed its construction by Retrievers. The Artifact itself was formed from a disassembled Gargantua-class transport.
Battle of Earth
Following the Prophet of Regret's retreat during the Battle of Earth, a massive Covenant fleet led by Jiralhanae arrived to swiftly take control of the battle from the Sangheili. On the same day, they started the uncovering of the artifact by low-range glassing. It is unknown when the process was completed, but it was ready for The Prophet of Truth's arrival on the 17th of November.
The Prophet of Truth landed the Forerunner dreadnought on the Forerunner structure, and an unusual cyclonic electric storm started up above it. Before its activation, Truth traveled to the Superintendent's data center deep under New Mombasa, where Covenant forces had excavated a tunnel leading into the Artifacts' underground sections.
The UNSC military unit ONI Recon 111 reported to Commander Miranda Keyes that the "cruisers above the crater have stopped...they've found something." The UNSC attempted to attack the structure, falsely presumed to be the Ark by UNSC intelligence; but was unsuccessful due to heavy Covenant Loyalist anti-aircraft batteries. A small strike force in the city of Voi, consisting of John-117, some Marines, and factory workers, neutralized an AA battery to clear a path for three Frigates and numerous Longswords. These then made several attacks on the Dreadnought with MAC strikes and air-to-air missiles, but with no effect. Truth then activated the gateway, opening a large Slipspace rift above the Artifact which led to the true Ark, Installation 00, which is revealed to be outside the Milky Way galaxy. Truth and the rest of the Loyalist fleet advanced through the rift quickly pursued by the Separatist fleet and two frigates of the UNSC Home Fleet.
In 2553, after the battle, civilian xenoarchaeologists were hired by the Office of Naval Intelligence to study the artifact. While closed, it was still drawing power from an unknown source and the majority of the passageways below it were still unexplored.
The storm was first seen in the Halo 3 Announcement Trailer, when the camera shows the artifact being uncovered and activated. The storm lies directly over it, lightning bolts are seen flashing out of the clouds, and the formation seems to have an eye, like a hurricane would. When the portal is activated, the beam travels up through this eye and disappears.
In the level Crow's Nest, when a player looks up at some of the computer monitors, you will see a map of the local area. The map will have a mass of clouds beginning to show a swirling motion around the area. When you enter the level Tsavo Highway, you can see a doughnut-shaped mass of clouds above the artifact that the Covenant are excavating. When you proceed to the level The Storm, the storm has intensified and grown. The clouds now bring rain to the area, and certain parts of the cloud glow as if cloud-to-cloud lightning is occurring. When Truth activates the Artifact, the solid blue beam shoots up into the cloud formation's eye and opens the portal to the Ark.
After the portal is opened, and the level Floodgate begins, the remains of the clouds are seen broken up and swirling around the portal in the sky, having been disrupted by the opening of the portal itself.
The artifact is also seen in the ending cinematic of Halo 3: ODST, where a fleet of Covenant ships are excavating the object.
The artifact is over 100 kilometres (62 mi) in diameter and stretches from the eastern perimeter of what is left of Voi all the way to New Mombasa on the east African coastline.
In-game, the diameter of the structure is estimated to be 25.515 kilometers using the size of a Covenant Battlecruiser above the portal and an overhead image or Pan Cam coordinates. It can be assumed that the portal is smaller in-game than its actual intended size, due to engine limitations; generating map geometry for over a 10,700 km2 area would be an impossibility on the Halo 3 engine
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