Deeper Than Yesterday (2010)

Plot

After spending three months trapped beneath the surface, the men have devolved into primal beings. Oleg grapples with the terrifying notion that detaching from reality could lead to losing his identity altogether. As their conditions worsen, he must confront the struggle between survival and maintaining his humanity. With each passing day, the line between civilization and savagery blurs, challenging Oleg's resolve and forcing him to fight not just for his life, but for the essence of who he truly is.