“Security Net” is a scenario for a future Nuclear Risk Reduction Regime in Southern Asia. It explores what such a regime might look like, how it might come into existence, what are its central challenges, and what might be its ramifications for nuclear proliferation and nonproliferation policy in Southern Asia today. This study examines the idea of a “Southern Asia” itself and considers the differences between the relationship of regional identity formation to nuclear non-proliferation in Southern Asia in comparison to Southeast Asia and Latin America. It then considers what sort of internal drivers, wild cards, or outside forces could create incentives for regional cooperation on Nuclear Risk Reduction in Southern Asia the future