 Each subject of the experiment was initially thoroughly interrogated, with torture applied as a mean to expose intimate details of his life ("external unmasking").Hence, they were required to reveal everything they were thought to have hidden from previous interrogations; hoping to escape torture, many prisoners would confess imaginary misdeeds.The second phase, "internal unmasking", required the tortured to reveal the names of those who had behaved less brutally or with relative indulgence to them in detention.