  Analysis of large dynamic networks is a thriving research field, typically
relying on 2D graph representations. The advent of affordable head mounted
displays however, sparked new interest in the potential of 3D visualization for
immersive network analytics. Nevertheless, most solutions do not scale well
with the number of nodes and edges and rely on conventional fly- or
walk-through navigation. In this paper, we present a novel approach for the
exploration of large dynamic graphs in virtual reality that interweaves two
navigation metaphors: overview exploration and immersive detail analysis. We
thereby use the potential of state-of-the-art VR headsets, coupled with a
web-based 3D rendering engine that supports heterogeneous input modalities to
enable ad-hoc immersive network analytics. We validate our approach through a
performance evaluation and a case study with experts analyzing a co-morbidity
network.
