  We show how current LIGO data is able to probe interesting theories beyond
the Standard Model, particularly Dark Sectors where a Dark Higgs triggers
symmetry breaking via a first-order phase transition. We use publicly available
LIGO O2 data to illustrate how these sectors, even if disconnected from the
Standard Model, can be probed by Gravitational Wave detectors. We link the LIGO
measurements with the model content and mass scale of the Dark Sector, finding
that current O2 data is testing a broad set of scenarios where the breaking of
$SU(N)$ theories with $N_f$ fermions is triggered by a Dark Higgs at scales
$\Lambda \simeq 10^8 - 10^9$ GeV with reasonable parameters for the scalar
potential.
