Act 1:

In the year 1983 an Ice Sheet in Enderby Land in Antarctica is broken off and reveals a cave, untouched by anyone. A group of 7 Russian researchers is sent to investigate and study The Cave. The research team arrives at a research facility in Enderby Land and start examining The Cave, days pass then weeks and months but with no progress.

Act 2:

Having to leave due to finding no new discoveries they prepare to return, but while doing so they start hearing a woman's singing voice coming from the cave, curiosity takes over and they move towards it, the singing gets louder and they start walking into The Cave mindlessly. They keep walking and walking... until the singing stops, they look around only to find out that they are now in The Cave, now lost and surrounded by nothing but snow and only one direction to follow. Now feeling cold, trapped, and helpless, with no other choice other than to move forward hoping to reach an exit. 

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Act 3:

Now lost in The Cave, they walk and walk till their senses and limbs start to go numb, one of them collapses then another and another until one last researcher remains, he sees a distant light and rushes towards it but collapses on the ground right before reaching the exit. With every single one of them laying on the ground, freezing and dying, their eyes slowly close shut and even though their limb and senses are numb, even though they can't see, feel or even hear, a voice starts singing once more but even when they can't hear a single thing, they can hear the singing and while their eyes are closed and listening to the singing voice, they give in to the freezing cold, it takes over and covers their dead bodies.

Act 4:

Weeks pass and another group is sent to check on the researchers but find nothing, they search the facility and still nothing, they look around and near The Cave but find no trace of them, the bodies of the researchers that were close to the entrance of the cave were gone, no trace of their dead frozen bodies.