  Motivated by the lack of consensus on whether or not de Sitter (dS) lies in
the Swampland, we use a recently developed braneworld construction and known
Anti-de Sitter (AdS) vacua to compute an explicit effective dS cosmology in
three dimensions. We consider a non-perturbative AdS$_4$ vacuum decaying to
another lower AdS$_4$ vacuum via bubble-nucleation. We also consider the more
speculative case where a dS$_4$ decay to a Minkowski$_4$. The Israel junction
conditions are solved across the bubble and we obtain the Friedmann equations
from which the cosmological constants can be read off, in the respective cases.
The cosmological constants are computed in a flux background yielding small
positive values admitting a dS cosmology. However, we find that an
energetically viable model in the AdS to AdS case requires more fine-tuning.
