IIIThe Other Country
In this chapter
3,700 m – 3,900 m · pelagine
Vault-eel
A Pelagine organism associated with the Vault of Hours, observed only from submersibles and at distance, whose function within the Pelagine archive the author does not pretend to understand.

The most accurate sentence the survey can write is that the vault-eel is present at the Vault. Beyond that, the observations are limited by what a porthole permits at four kilometres. I have included the organism here because it is real, observable, and unclassified, and because the Vault's residents have a standing the survey's category system was not built for.
The vault-eel is present at the Vault of Hours. This is the most accurate statement the survey can make about it. Beyond presence, observation is limited: the animal — if that word applies — is long, sinuous, and slow, and it does not approach the submersible. It moves in the water above the Vault in patterns that repeat across dives separated by months. Whether the same individuals are returning, or whether the pattern is a property of the organism's relationship with the place rather than of any specific creature's habit, the survey has not resolved.
The name is the author's and is admitted to be inadequate. The Tyrian Court's translators have offered a word that refers to this organism, approximately rendered as the ones who hold the record open, which the author does not pretend to decode.
As observed
The vault-eel's body, resolved at the limits of the submersible's optical range, suggests an elongated bilateral form, perhaps four to eight metres in largest dimension. It does not appear to feed, in observed periods. It does not aggregate or disperse in response to the submersible's illumination, though it has on two occasions oriented momentarily toward the vessel before resuming its prior course. The Vault itself — the water formation, the acoustic chamber — appears to be the locus of the organism's attention in a way the survey can describe but not explain.
What the survey declines to say
The survey declines to classify the vault-eel as fauna, and declines equally to classify it as a Pelagine polity or individual. It is noted here because it is real, observable, and unclassified. The Vault of Hours is one of the stranger places the submersible record describes; it is not surprising that its residents resist the category system the survey brought down with it.
The ones who hold the record open — the Court's translators rendered it that way, and declined further. I have not pretended to decode it.