After returning to the ministry, Blake, Pradier and Labrousse intercept a new coded message: a large fog will cover the entire Western Europe in two days, perfect weather for an invasion. The DST therefore has two days to find Olrik.
Returning to their post, Blake, Pradier, and Labrousse intercepted a fresh encoded message: a dense fog would blanket all of Western Europe within 48 hours, creating the perfect setting for an attack. With this knowledge, the DST had just two days to track down Olrik.