Plot hole: Towards the end of the movie, the characters use cell phones to determine whether or not the enemy is coming. However, throughout the whole movie, one of the girls has her cell phone, which never goes off even when the enemy is close.
The Darkest Hour (2011)
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Directed by: Chris Gorak
Starring: Emile Hirsch, Max Minghella, Olivia Thirlby, Rachael Taylor
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Suggested correction: When she is on the submarine, the engineer hands it to her and tells her he replaced the broken parts and it works now. That is why it didn't trigger for the aliens.