The Comprehensive Test Ban Treaty Organization (CTBTO), the international organization that oversees the CTBT and its verification, is offering a free online course, “Around the Globe and Around the Clock: The Science and Technology of the CTBT”.
The course description says:
The course will take an in-depth look at the science behind the verification technologies of the CTBT, as well as the conduct of on-site inspections to verify compliance with the nuclear test ban. The course will include live lectures from internationally-renowned guest expert lecturers as well as CTBTO staff, interactive sessions and site visits. It can be completed in full online and is completely free of charge.