  This work regards IIB string theory embeddings of massive and bi-metric
$AdS_{4}$ gravity where the spectrum of the theory includes multiple massive
gravitons. The corresponding geometry consists of multiple
$AdS_{4}\times_{w}\mathcal{M}_{6}$ spacetimes coupled by Janus throats of
different radii. In the second part of this work, the AdS distance conjecture
is studied in the above context and it is shown that the scale of the predicted
infinite tower of light states is related to the breakdown scale of the
effective field theory.
