Face-on spatial distributions of two galaxies, m11d and m12b, where superbubble outbreak visibly occurs across consecutive snapshots. Left panels show low-mass galaxy m11d near z|$\sim$|0, while right panels show MW-mass progenitor m12b at z|$\sim$|1. Top row depicts the spatial distribution of the cooler gas (⁠|$T \lt 10^5$| K), middle row shows the 40 Myr-averaged SFR, and the bottom row shows the hot gas (⁠|$T \gt 10^5$| K). In the first snapshot (first column) for each galaxy, star formation, cold–warm gas, and hot gas can be seen to cluster in the central region of the galaxy. In the second snapshot (middle column), we see the formation of a bubble, i.e. a shell-like structure in the cooler gas. Lastly (right columns), the diffuse hot gas is seen to break out from the bubble, thus concluding the evolution of the superbubble itself into the near-CGM.