影片讲述,宇航员Lee Miller与地球失去了联系,他一个人生活在国际空间站、周而复始得环绕着地球。但随着时间的流逝,生命供给系统日趋耗尽,Lee必须想尽一切办法维持头脑的情形——或者致死最低限度的生存。他的生活是幽闭恐惧症与孤独的存在,直到他在飞船上有了一个奇怪的发现……影片探讨了人类对交流最基本的需求与希望无限的力量。After losing contact with Earth, Astronaut Lee Miller becomes stranded in orbit alone aboard the abandoned International Space Station. As the life support systems dwindle, Lee battles to maintain his sanity whilst he alternates between performing repairs and reading the 1864 journal of an American Civil War soldier Captain Briggs. He faces a slow, claustrophobic and lonely death, until he discovers the mysterious object found by Briggs aboard the ship.