George Carlin famously said that it's the quiet ones you have to watch out for.

Although Carlin was making a lighthearted comment on crime and punishment, his joke couldn't be more true for today's episode.

Phil Costin is The Fed's Buildings Manager, responsible for the development of the site and it's maintenance. A much-loved and respected figure across the organisation, Phil exudes calmness and good cheer and can always be relied on for a smile and a friendly greeting.

This cheerful exterior, however, masks a lifetime of tragedy and hardship that almost defies belief.

Phil shares his extraordinary life story with Humans, revealing the mystery of his origins, the tragedy that rocked his family, illness and suffering that have shaped his adult life, and - perhaps most importantly - how he came through it all to be the positive and delightful colleague everyone at The Fed knows.

Not content with carving out a successful career amid his many challenges, Phil's life has taken him into the world of professional rugby, to the slopes of Mount Everest, and to the very summit of the martial arts world, as a five-time kickboxing World Champion.