  While finite-time blowup solutions have been studied in depth for the
Keller-Segel equation, a fundamental model describing chemotaxis, the existence
of finite-time blowup solutions to chemotaxis-fluid models remains largely
unexplored. To fill this gap in the literature, we use a quantitative method to
directly construct a smooth finite-time blowup solution for the
Keller-Segel-Navier-Stokes system with buoyancy in 3D. The heart of the proof
is to establish the non-radial finite-codimensional stability of an explicit
self-similar blowup solution to 3D Keller-Segel equation with the abstract
semigroup tool from [Merle-Rapha\"el-Rodnianski-Szeftel, 2022], which partially
generalizes the radial stability result [Glogi\'c-Sch\"orkhuber, 2024] to the
non-radial setting. Additionally, we introduce a robust localization argument
to find blowup solutions with non-negative density and finite mass.
