Hopefully there was some chlorine in this one:

IAEA commissioner falls into water tank at Czech nuclear plant
Jihlava, South Moravia, Sept 23 (CTK) - A US commissioner from the Vienna-based International Atomic Energy Agency (IAEA) emerged unharmed after falling into a water tank at the Dukovany nuclear power plant on Friday. The daily Mlada fronta Dnes reported Friday that commissioners training at the facility were moving around the plant in a group. One of them, however, left the group and fell into the tank. . . . Although the water was not in contact with any nuclear fuel during the training, the commissioner was examined to make sure he was not contaminated with radioactivity.