Watch FMovies. In the deep ocean, life is concentrated at chemosynthetic oases where primary production is made possible via chemosynthesis at cold seeps and deep sea hydrothermal vents. The non-chemosynthetic regions of the deep are divided into two very different worlds. The worlds of the deep sea could not be more different, and yet their stories are fundamentally intertwined. In this movie, we delve into the Twilight Zone.