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.
More information and registration for the course are available online.