After graduating from Meridian University, four close friends Alex, Maya, Ben, and Sara, embark on an adventurous journey to explore the enigmatic Forbidden Grand Canyon, a place shrouded in myth and secrecy. Guided by ancient maps and legends, they navigate treacherous terrain and harsh conditions, driven by the allure of uncovering hidden truths. Their expedition leads them to a concealed entrance, revealing an expansive underground city illuminated by otherworldly light and filled with advanced technology far beyond contemporary understanding. The city's inhabitants, known as the Guardians, are an advanced race that fled to the canyon to escape a catastrophic event. The Guardians are initially wary but agree to share their knowledge under strict conditions.