From Halopedia, the Halo wiki
The Mark VIII Cryogenic Suspension Chamber (CSC) is the newest model of UNSC-issue cryogenic storage unit. Manufactured by Jakubaitis Standard Systems, it replaced the Mark VII Personal Suspension Unit. John-117 was frozen in one of these tubes for over four years aboard the UNSC Forward Unto Dawn after the Ark's portal collapsed.
John-117 in a Mark VIII Cryogenic Suspension Chamber.
A trio of Mark VIII Cryo-Chambers in Dawn's cryo bay.
Extracted view of a Mark VIII cryo-chamber.