The hibernation unit, (TV: Doctor Who and the Silurians, The Sea Devils) also referred to as the hibernation chamber, (AUDIO: Bloodtide) with the force that kept the Silurians in suspended animation being called the hibernation matrix, (TV: The Blood Line) was an item of Silurian (TV: Doctor Who and the Silurians) and Sea Devil (TV: The Sea Devils) technology which allowed them to enter into a state of hibernation in order to survive harsh conditions and the centuries. They resembled coffin-shaped blocks in which a Silurian resided. (TV: Doctor Who and the Silurians)