  Two related issues are explored for bond percolation on the d-dimensional
cubic lattice (with d > 2) and its dual plaquette process. Firstly, for what
values of the parameter p does the complement of the infinite open cluster
possess an infinite component? The corresponding critical point p_fin satisfies
p_fin >= p_c, and strict inequality is proved when either d is sufficiently
large, or d >= 7 and the model is sufficiently spread out. It is not known
whether d >= 3 suffices. Secondly, for what p does there exist an infinite dual
surface of plaquettes? The associated critical point p_surf satisfies p_surf >=
p_fin.
