  The gauge usually adopted for extracting the reduced Hamiltonian of a thin
spherical shell of matter in general relativity, becomes singular when dealing
with two or more intersecting shells. We introduce here a more general class of
gauges which is apt for dealing with intersecting shells. As an application we
give the hamiltonian treatment of two intersecting shells, both massive and
massless. Such a formulation is applied to the computation of the semiclassical
tunneling probability of two shells. The probability for the emission of two
shells is simply the product of the separate probabilities thus showing no
correlation in the emission probabilities in this model.
