Resonance

A young couple, Max and Elena, goes on a field trip and stumbles upon strange noises resonating from deep within the woods. These strange and haunting sounds have, besides negative psychological impact, severe physical effects and when Elena starts bleeding internally, she desperately needs a doctor. Max discovers that the noise is blocking all electronic signals and realizes that the only way to get help will be to go straight through the woods, but something doesn't want them to leave.