Project Valhalla. The Omnilogos Singularity, #1.5

Some secrets must remain buried. In an unknown location north of the Barents Sea, a research center as tall as the Eiffel Tower hides the greatest scientific discoveries of the 21st century. The few who know of its existence call it Valhalla, but none suspect why it was built. When Dr. Selene Sato accepts a job at Valhalla for eccentric billionaire Wei Wang, she discovers more about human ingenuity than she ever thought possible. But there is a secret buried in this outpost of progress hiding a catastrophic scenario: destruction on a planetary scale never before seen in human history. Wei prepares for war as Valhalla holds the only defense capable of repelling the coming apocalypse. Project Valhalla is a novella set in the techno-thriller series The Omnilogos Singularity.
It should be read after the first book, Rise of Polaris.