“U.S. nuclear officials suspect Japanese plant has a dire breach”
“U.S. government nuclear experts believe a spent fuel pool at Japan’s crippled Fukushima reactor complex has a breach in the wall or floor,”
http://www.latimes.com/news/nationworld/world/la-fg-japan-quake-wrapup-20110318,0,2262753.story
Finally someone explains how the spent fuel pool can be empty. Other accounts were making it sound as if the deep pool just evaporated.