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Instead of freezing a being in a stasis, the Slipspace Field Pods put the user into Slipspace, where time stops without motion. It is unknown whether these would work during Slipspace transit, because they freeze units by putting them in Slipspace itself. If they cannot operate in Slipspace transit, then it is clear that they are not intended as a method to prevent aging during Slipspace travel, but maybe as a mini fallout shelter to survive the Halo Array's activation.
Forerunner Slipspace pods are somehow connected to slipspace and normal space, the actual bodies contained inside the pods are within slipspace, making them safe from nearly everything. (Nearly means that they might be able to be killed if they are engaged within Slipspace, otherwise, normal space cannot hurt the person inside.)
They are visible via an afterimage seen within the pod, essentially a snapshot of the moment they "left" time. Although not technically in our space, those stored "within" the pods may be transported by moving the pods themselves. This method works as the Slipspace generator is located on each pod. If a person comes too close to the pod they will develop nausea, and a feeling of light-headedness due to exposure of an unshielded Slipspace field.
On the sides of the pods there are Forerunner icons which Dr. Catherine Halsey translated into "That which must be protected...behind the sharpened edge of the shield...beyond the reach of the swords...for the reclaimed". However, Dr. Halsey noted that her translation was off, and agreed with Ash when he suggested that is was instead "Reclaimers", when he brought up about his encounter with an Onyx Sentinel. This was not the first time the word has been misinterpreted this way, as the same mistake was made by the Covenant late in their history, in which the Oracle residing within the Forerunner Dreadnaught noted and corrected as "Reclaimers".
- Halo: Ghosts of Onyx (First appearance)