Believe it or not, the cleaning must be sufficiently scrupulous so as to ensure that not a single grain of desert sand is transported out of the Middle East, lest it carry bacteria or diseases back to U.S. shores.

CENTERFORSECURITYPOLICY: Dunkirk in the desert

The Graf Goetzen was then transported in parts, in 500 crates, from Hamburg to Dar es Salaam on the coast of East Africa - and from there over mountains to Lake Tanganyika where Germany, Britain and Belgium were all engaged in colonial jostling.

BBC: Hope yet for African Queen gunboat on Lake Tanganyika