1Picasa This experiment is about detecting Supernova bursts before it is visible to telescopes. Neutrinos radiated out of the super massive explosion of a star could be detected by these detectors. It would allow advance warning to allow observations to be prepared before any visible event occurs. See full resolution of this picture for more details on this experiment.
2 32 columns of detectors.
3 Each column contains 4 of these rods. Each rod is filled with Helium-3 which (at least at the time) was very expensive. Each of these rods cost thousands of dollars.