The 4th URL Workshop has four sessions, with available abstracts and presentation files hyperlinked and given below in parenthesis in this agenda. The morning sessions focus on rock engineering and physics in Asia, Europe, and North America deep physics labs. The North American and Europe Lectures will follow Asian Lectures. The afternoon sessions focus on radioactive waste and on energy/environmental experiments in URLs and other underground settings. We will reverse the order and have European and North American Lectures first, followed by Asian Lectures.