  We study towers of light particles that appear in infinite-distance limits of
moduli spaces of 9-dimensional $\mathcal{N}=1$ string theories, some of which
notably feature decompactification limits with running string coupling. The
lightest tower in such decompactification limits consists of the non-BPS
Kaluza-Klein modes of Type I$'$ string theory, whose masses depend nontrivially
on the moduli of the theory. We work out the moduli-dependence by explicit
computation, finding that despite the running decompactification the Distance
Conjecture remains satisfied with an exponential decay rate $\alpha \ge
\frac{1}{\sqrt{d-2}}$ in accordance with the sharpened Distance Conjecture. The
related sharpened Convex Hull Scalar Weak Gravity Conjecture also passes
stringent tests. Our results non-trivially test the Emergent String Conjecture,
while highlighting the important subtlety that decompactification can lead to a
running solution rather than to a higher-dimensional vacuum.
