  Thus far, the known wormholes in string theory connecting disjoint boundaries
represented by finite volume quotients of hyperbolic spaces leak: they are
non-perturbatively unstable towards brane-anti-brane nucleation in the flux
backgrounds that support these wormholes. Turning on additional fluxes
suppressed this instability, but would not completely eliminate it. We present
the first example of a non-perturbatively stable wormhole in type IIB
supergravity on a warped squashed conifold with fluxes.
