Summary/Introduction Aschenbrenner’s ‘Situational Awareness’ (Aschenbrenner, 2024) promotes a dangerous narrative of national securitisation. This narrative is not, despite what Aschenbrenner suggests, descriptive, but rather, it is performative, constructing a particular notion of security that makes the dangerous world Aschenbrenner describes more likely to happen. This piece draws on the work of Nathan A. Sears (2023), who argues that the failure to sufficiently eliminate plausible existential threats throughout the 20th century emerges from a ‘national securitisation’ narrative winning out over a ‘humanity macrosecuritization narrative’. National securitisation privileges extraordinary measures to defend the nation, often centred around military force and logics of deterrence/balance of power and defence. Humanity macrosecuritization suggests the object of security is to defend all of humanity, not just the nation, and often invokes logics of collaboration, mutual restraint and constraints on sovereignty. Sears uses a number of examples to show that when issues are constructed as issues of national security, macrosecuritization failure tends to occur, and the actions taken often worsen, rather than help, the issue. This piece argues that Aschenbrenner does this. Firstly, I explain (briefly and very crudely) what securitisation theory is and how it explains the constructed nature of security. Then, I explain Sears (2023)’s main thesis on why Great Powers fail to combat existential threats. This is followed by an explanation of how Aschenbrenner’s construction of security seems to be very similar to the most dangerous narratives examined by Sears (2023) by massively favouring national security. Given I view his narrative as dangerous, I then discuss why we should care about Aschenbrenner’s project, as people similar to him have been impactful in previous securitisations. Finally, I briefly discuss some more reasons why I think Aschenbrenner’s project is insuffic