TLDR: Vacuum decay is a hypothesized scenario where the universe's apparent vacuum state could transition to a lower-energy state. According to current physics models, if such a transition occurred in any location — whether through rare natural fluctuations or by artificial means — a region of "true vacuum" would propagate outward at near light speed, destroying the accessible universe as we know it by deeply altering the effective physical laws and releasing vast amounts of energy. Understanding whether advanced technology could potentially trigger such a transition has implications for existential risk assessment and the long-term trajectory of technological civilisations. This post presents results from what we believe to be the first structured survey of physics experts (N=20) regarding both the theoretical possibility of vacuum decay and its potential technological inducibility. The survey revealed substantial disagreement among respondents. The mean credence that the apparent vacuum is only metastable, and thus vulnerable to vacuum decay, was 46%, with respondents evenly clustered into three groups: 0-10%, 50%, and 70-95%. Conditional on metastability, the mean credence that vacuum decay is inducible with arbitrarily advanced technology was 19%, with a slim majority finding its likelihood negligible, but a substantial minority asserting high likelihood. According to participants, resolving these questions primarily depends on developing theories that go beyond the Standard Model of particle physics. Among respondents who considered vacuum decay theoretically possible, it was generally expected that artificial induction would pose significant technological challenges even for a civilisation with galactic resources. Background What is Vacuum Decay? Modern physics describes the world in terms of quantum fields (such as the electromagnetic field) that extend over space and that can together be configured in many ways. The vacuum is the lowest-energy joint c