The basic umbilical is a reinforced frame with a flexible membrane over it. They are designed to attach at the various hatches on the CRDM. This allows multiple CRDM's to be connected to maintain a controlled environment within the collection. Each module has a locking seal that secures it and provides an airtight seal. Some modules have extensions available for mating to the side of the CRDM. The floors are covered in a non-skid material for safety. The ceiling is reinforces with ribbing a tinted to limit the amount of sunlight.
The Umbilicals come in the following forms
This is the basic interconnect. It is typically attached to the ends of the CRDM's but can be attached to the side hatch by means of extensions.