For nuclei with very high electrical charge, the Coulomb field is expected to drive the protons away from the centre to the surface of the nucleus. Such a nucleus would be no more compact but would look like a bubble. The goal of this work is to confirm this idea. We are interested in only the ground state of spherical nuclei. We use the Skyrme potential with the Sly4 parametrization to calculate the mean-field Hamiltonian. Pairing correlations are described by a surface- active delta pairing interaction. In its ground state, the nucleus ^A=900X_Z=274 is shown to be a bubble. Another stable state is found, with a little higher energy: it is also a bubble.
 

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