I want to know the answer to the following question:
In what is the torch flame kept lit when the torch must be off?
All the background I'm provided with is that "When the Torch is extinguished at night, on airplanes, in bad weather, or during protests (such as the several occasions in Paris), the Olympic Flame is kept alight in a set of 8 lanterns.[citation needed]". Is that enough to answer the question?