In his last mission, Heston is on board a nuclear-powered Royal Navy submarine, HMS Turbulent, to shake up the sailors' food using the revolutionary sous vide method.
Heston's mission is to revolutionise British Airways airline food, but with no kitchen, no pans, no sharp knives and no naked flames, Heston realises that cooking gourmet food in a metal tube at 37,000 ft is no mean feat.