Slaver stasis field
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The Slaver stasis field is a fictional technology from Larry Niven's Known Space series, a product of Tnuctipun ingenuity and creativity. Inside the field, time is slowed to a near stop, with billions of years passing on the outside before one second passes on the inside.
The field creates a bubble of space/time that runs separate from the rest of the universe. Anything inside a stasis field can not be affected by anything outside of the field. The only exception to this rule is if two stasis fields are rammed into each other at high speeds. This causes a catastrophic collapse of both fields, destroying whatever is inside. Similarly, one stasis field cannot exist within another; the inner one is deactivated while the outer one is extant, allowing objects within the outer field to interact with those within the inner field.
A concept similar to this can be found in the Artemis Fowl (series).