First Referenced:
'I was told that everyone I'd served with in the military died shortly after I left.'
The Ink is a zone of zero electromagnetic radiation, several miles wide. Characterized by the observable effect of blocking or absorbing all visible light, this phenomenon can only be illuminated to the range of approximately 10 feet from the source of radiation. As the phenomenon also affects radio, the only way to communicate further than this range is via overlapping relay station less than 10 feet apart. UAV flights would lose contact when travelling through The Ink, but would eventually emerge from the other side having recorded nothing visible.
While it is unknown how The Ink is being maintained or created, it appears to be home to various dangerous entities, including a large reflective mirror-like creature known as a Mirror Octopus, described by Higgins as being similar to a gigantic snake or tentacle. As well as the mirrored creature, The Ink also appears to be inhabited by intelligent, malicious creatures who deliberately taunted Higgins by placing dismembered remains of his squad mates in his path while he was attempting to escape.
Traits:
Blocks all electromagnetic radiation beyond a range of 10 feet from its originating source. Extends across a range of miles and is inhabited by a variety of mostly unknown but hostile creatures.