Extended closure and reopening The attraction made use of most the interior of the original attraction and was themed around a viral outbreak, where test subjects had developed animalistic qualities. Following months of speculation, the ride reopened on 27 May 2023.

Yes, Nemesis Sub-Terra officially reopened at Alton Towers Resort on May 27, 2023. The attraction had been closed since 2015, leading many fans to fear it had been shuttered permanently. Its return was part of a larger revitalization of the "Forbidden Valley" section of the park, coinciding with the major refurbishment of the legendary Nemesis roller coaster (which was rebranded as Nemesis Reborn in 2024). The 2023 version of Sub-Terra retained its original "Phalanx" research facility theme but featured updated special effects, live actors, and a slightly modified "decontamination" finale. It remains a unique "drop tower" dark ride experience that blends psychological horror with physical thrills, as guests descend into a cave to observe a mysterious alien egg that inevitably "hatches" during the show.