Fans of James Cameron's The Abyss should check out these mysterious sci-fi movies for more of the same high-concept intrigue ...

Based on the story “The Abyss” by Leonid Andreev. A young couple spends the day on a walk, enjoying the timid feeling of falling in love for the first time. However, the heroes walk too long.

The story follows an orphaned young girl, Riko, who finds and befriends a humanoid robot Reg and descends with it into the titular "Abyss", that leads deep into the Earth, in hopes of finding her ...