There are two classes of man-made explosions in or over the ocean: nuclear and chemical. Until the advent
of the Comprehensive Test Ban Treaty, nuclear devices were tested regularly in the ocean, in the
atmosphere above the ocean, or on oceanic islands. The most recent series of oceanic tests was conducted
by France in 1995-1996 on the islands of Fangataufa and Mururoa in the South Pacific. There is currently
a low probability of continued ocean testing of nuclear devices although this situation could change with
geopolitical developments over the coming years or decades.