In 1987 the author purchased a box of early glass slides. There was no explanation as to their origin or content. He was busy so he put them in his loft and forgot them. Thirty years later in 2017 when he retired he re-discovered them. He found that they were over one hundred years old. At fi rst he thought they were taken in South America as they showed natives with bare feet and ancient crossbows. After having the photographs processed into digital format, he realized that they related to a military mission by fi ve men connected to Australia and Great Britain in the period of the 1st World War. They acquired one of the fastest yachts afl oat known as the G.L. WATSON 'RAINBOW' in order to inspect and repair the under-sea telegraph and radio systems that was tremendously important to shipping safety and military information and logistics. The secretive journey took them throughout South-East Asia and Vietnam with visits to the Cocos-Keeling Islands. They spent a long time in Vietnam taking photographs which tell a story of why the French Military were building huge gun emplacements at Cape Saint Jcques (now called Vung Tau).