  We construct a single-boundary wormhole geometry in type IIB supergravity by
perturbing two stacks of $N$ extremal D3-branes in the decoupling limit. The
solution interpolates from a two-sided planar AdS-Schwarzschild geometry in the
interior, through a harmonic two-center solution in the intermediate region, to
an asymptotic AdS space. The construction involves a CPT twist in the gluing of
the wormhole to the exterior throats that gives a global monodromy to some
coordinates, while preserving orientability. The geometry has a dual
interpretation in $\mathcal{N}=4$ $SU(2N)$ Super Yang-Mills theory in terms of
a Higgsed $SU(2N) \to S(U(N) \times U(N))$ theory in which $\mathcal{O} (N^2)$
degrees of freedom in each $SU(N)$ sector are entangled in an approximate
thermofield double state at a temperature much colder than the Higgs scale. We
argue that the solution can be made long-lived by appropriate choice of
parameters, and comment on mechanisms for generating traversability. We also
describe a construction of a double wormhole between two universes.
