In a luxury bunker designed to endure any imaginable catastrophe, a group of billionaires is forced to coexist after locking themselves in due to the threat of an unprecedented global conflict. Kimera Underground Park becomes a claustrophobic setting for two families marked by a wound from the past. Isolated underground and with no possibility of escape, they unleash personalities uncovering their most unconfessable secrets. But the most unexpected alliances also emerge. An excessive and surprising emotional X-ray of billionaires living in a golden hole.