Beta Gamma Tiberius

Beta Gamma Tiberius is the designation given by the Adeptus Mechanicus to the Space Hulk featured in Space Hulk: Deathwatch.

Known Sections
While much of the Space Hulk has yet to be mapped, there were a few locations mentioned in the narrative campaign Space Hulk: Deathwatch.

Sentinels of the Forge Cruiser
The first area that Inquisitor Rhyn's Deathwatch discovered was a cruiser from an unknown Space Marine chapter known as the Sentinels of the Forge. This was captured and used as the main staging area for Rhyn's operations, as it included a powerful and still functional teleporter array.

Xenos Vessel
At the heart of the Space Hulk lay the xenos vessel belonging to the same species that created the Jewels of Ymir. Not much information was given about the vessel in the campaign, except that it possessed a powerful Warp drive that could blend reality and the immaterium, which allowed it to produce faster than light speeds without actually fully entering the warp. The warp drive was malfunctioning at the time of the Deathwatch's arrival, creating "Da Uvver Place" within the Space Hulk.

The xenos vessel was ultimately destroyed, although its warp drive was responsible for scattering large sections of the Space Hulk around the galaxy.

Da Uvver Place
Named so by the Orks aboard the ship, Da Uvver Place was the area surrounding the xenos vessel that was being influenced by its malfunctioning warp drive. Reality as bent and skewed, creating impossible architectures and shapes.

It was also home to The Beast, a power warp creature that feasted on the souls of other creatures. The Beast also contained a host of Enslavers, which were unwittingly released by Rhyn's Deathwatch when they slaughtered The Beast (with the help of The Witch, who was also captured inside of The Beast).

Fate of the Space Hulk
In the end many parts of the Space Hulk were destroyed when the warp drive of the xenos vessel went critical. However, many large sections were observed to be cast back into the warp, hurled to other areas of the galaxy.