`Darkness' takes reality TV's survival genre to new levels of mental and physical challenges. Inspired by sensory-deprivation training used by NASA and military forces, the series records the limits to which survivalists push themselves while trapped inside caves, abandoned mines and underground convolutions for up to six days. Attempting to exit complete darkness, they work as a team but struggle to combine their diverse skill sets as the effects of prolonged light deprivation take hold. To keep the experience as immersive as possible, participants are outfitted with custom-designed camera equipment, enabling them to document their own journey without any exposure to light.