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Fifteen strangers who have volunteered for an experiment in isolation are forced to deal with an even larger problem in this film from Italian director Giuliano Montaldo. A research group in Germany wants to study the effects of isolation in a nuclear shelter on human subjects and assembles a diverse group of people for the test. The strangers agree to stay in the shelter for 20 days, but are allowed to exit at any time. During their time in the shelter, the group experiences a wide range of social dynamics, but near the end of their stay in the shelter, it is learned that a real nuclear incident is underway and the test group will be forced to stay in their shelter indefinitely. Featured in the cast are Burt Lancaster, Ben Gazzara, and Kate Nelligan.