Proceedings of the Particle Physics and Early Universe Conference (PPEUC). ... Department of Physics , University of Bristol, Tyndall Avenue, Bristol BS8 1TL, U.K. M. Birkinshaw . Department of Physics, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, U.K. We set limits to the amount of intra-supercluster gas in the Shapley Supercluster, using COBE DMR data to search for the Sunyaev-Zel'dovich effect and HEAO-1 A2 and ROSAT All-Sky Survey data to search for diffuse X-ray emission. ...