  We study gravitational waves (GWs) with frequencies in the $\mu$Hz range,
which arise from phase transitions related to dark confinement in the context
of dark versions of Quantum Chromodynamics. Based on several compelling
motivations, we posit that these theories predict the existence of GeV-mass
asymmetric dark baryons, akin to ordinary baryons, with the potential to
contribute to dark matter. Furthermore, we emphasize the significance of a
particular $\mathcal{O}(\text{TeV})$ scale for multiple reasons. First, to
account for the similarity in present-day mass densities between dark matter
and visible matter, various TeV-scale mechanisms can elucidate the similarities
in both their number densities and masses. Moreover, to address the so-called
electroweak hierarchy problem, we consider the introduction of either the
Composite Higgs or Supersymmetry at around $\mathcal{O}(\text{TeV})$. These
mechanisms lead to intriguing TeV collider signatures and the possibility of
detecting mHz GWs in future experiments. In summary, this study provides a
strong motivation for advancing GW experiments that can bridge the $\mu$Hz
frequency gap in the GW spectrum. Additionally, there is a need for the
construction of more powerful particle colliders to explore higher energy
regimes. In consideration of the possibility to scrutinize these models from
various perspectives, we strongly advocate their further development.
