"It Ends Here" (2014) was commissioned by Twentieth Century Fox Film Company to coincide with the release of the eighth film in the Planet of the Apes franchise, "Dawn of the Planet of the Apes".Firrell indicated his intention was to explore the deeper meaning of Planet of the Apes’ particular corner of pop culture, locating truths that cast light on our attempts to live humanely in an over-crowded and tension-filled world"

The project extended Firrell's interest in ‘mining popular culture for quite serious content’ 

Firrell created five different underground environments in the Vaults under London's Waterloo Station, each dominated by a word or phrase