Horizon (1965) - 45x02 - Total Isolation

Horizon investigates the controversial science of sensory deprivation. Six ordinary people are taken to a nuclear bunker and subjected to a world without stimulation. Three subjects are left alone in dark, sound proofed rooms, while the other three are given goggles and foam cuffs as white noise is piped into their ears.
Over the 48 hour experiment the changes in their mental functioning are investigated as their brains undergo strange alterations.