Stasis chamber

A stasis chamber or suspended animation chamber was a machine designed to suspend the biological functions of its occupant, keeping them alive and unchanged for prolonged periods.

The Tenth Doctor instructed Martha Jones to put him in a stasis chamber, minus 200 degrees, to freeze the invading system out of him. (TV: 42)

Elliot Northover was kept in a stasis chamber after he was taken by the Silurians. (TV: Cold Blood)

The Fisher King planned to place himself inside a suspended animation chamber and have his coordinates transmitted to his people so that he could be recovered. The Twelfth Doctor tricked him into leaving the chamber behind, and then used the chamber himself to return to the future. (TV: Before the Flood) The chamber would later be discovered by the crew of the Drum with the Doctor's help. (TV: Under the Lake)

After her apparent murder, Anah was kept in a stasis chamber in the trap street. (TV: Face the Raven)

Behind the scenes

 * The stasis chamber from the episode 42 is the redecorated MRI machine from Smith and Jones.
 * In the invalid source Attack of the Graske, the Graske kept its kidnapped creatures in stasis chambers.