  We study the black hole interiors in holographic Weyl semimetals and
holographic nodal line semimetals. We find that the black hole singularities
are of Kasner form. In the topologically nontrivial phase at low temperature,
both the Kasner exponents of the metric fields and the proper time from the
horizon to the singularity are almost constant, likely reflecting the
topological nature of the topological semimetals. We also find some specific
behaviors inside the horizon in each holographic semimetal model.
