  The cascade of electronic phases in CsV$_3$Sb$_5$ raises the prospect to
disentangle their mutual interactions in a clean, strongly interacting Kagome
lattice. When the Kagome planes are stacked into a crystal, its electronic
dimensionality encodes how much of the Kagome physics and its topological
aspects survive. The layered structure of CsV$_3$Sb$_5$ reflects in
Brillouin-zone-sized quasi-2D Fermi surfaces and a significant transport
anisotropy. Yet here we demonstrate that CsV$_3$Sb$_5$ is a three-dimensional
metal within the charge-density-wave (CDW) state. Small 3D pockets play a
crucial role in its low-temperature magneto- and quantum transport. Their
emergence at $T_{CDW}\sim 93$ K results in an anomalous sudden increase of the
in-plane magnetoresistance by 4 orders of magnitude. The presence of these 3D
pockets is further confirmed by quantum oscillations under in-plane magnetic
fields - demonstrating their closed nature. These results emphasize the impact
of interlayer coupling on the Kagome physics in 3D materials.
