The sophomore feature from Mystery Guitar Man turned budding filmmaker Joe Penna is an amplification of everything that went into his first film Arctic. The main cast has been doubled, the dialogue has increased exponentially, and while the setting is ostensibly far more cramped than the vastness of the Arctic, it serves as ground zero for a survival narrative that delves even further into dissecting human instincts. The result of all this is a film so refined, it retroactively makes Arctic look like splashing around in a kiddie pool by comparison.