It is not, however, an extra from a horror film in search of a meal, for soon afterwards it is followed by the emergency services digging down to find you.

This results in breadth-first traversal (compared to digging down into the first link found, which would result in depth-first behavior).

Alternatively, removing fuel from the fire—by chopping down trees, digging fire breaks and setting control burns ahead of it— also helps stop a fire in its tracks.