  We analyze a spacetime structure on a new brane configuration constructed
recently in the Dvali-Gabadadze-Porrati braneworld context. The brane, embedded
on a five-dimensional bubble of nothing, has a wormhole structure. It is an
exact solution without any matter fields, and thus the energy conditions for
matter fields are trivially satisfied. We see that, under the traversability
condition, the size of the bubble should be larger than 10^{10}cm or so.
