Triton is a British period television drama series which aired in four parts on BBC 1 in 1961.
[1] Set during the Napoleonic Wars, two Royal Navy officers go on an undercover mission to France discover Napoleon's secret weapon for his planned invasion of Britain.
It turns out to be a submarine designed by the American Robert Fulton, widely credited as the inventor of the first steamship.
Unlike many BBC programmes of the early 60s, it is believed all four episodes have survived.
In 1968 the story was remade by the BBC in another four part serial of the same title, which also exists with the British Film Institute.