  The space-time dimensions transverse to a static straight cosmic string with
a sufficiently large tension (supermassive cosmic strings) are compact and
typically have a singularity at a finite distance form the core. In this paper,
we discuss how the presence of multiple supermassive cosmic strings in the 4D
Abelian-Higgs model can induce the spontaneous compactification of the
transverse space and explicitly construct solutions where the gravitational
background becomes regular everywhere. We discuss the embedding of this model
in N=1 supergravity and show that some of these solutions are half-BPS, in the
sense that they leave unbroken half of the supersymmetries of the model.
