1997

1997 matters as an acoustic record whose significance changes when later observations are compared with it. The year supplies neither a settled explanation nor proof of an origin; instead, its unidentified spectrograms become a point of comparison in the effort to understand sounds associated with the ocean’s poorly known depths.

The 1997 recordings

During a later discussion of the URA’s findings, researchers identify definite similarities between its noises and unidentified spectrograms from 1997. The comparison makes the older records newly relevant, but it does not explain either set of sounds. The researchers acknowledge that they have a lead, not an account of what produced it.

A separate discussion identifies a sound detected in 1997 as Slowdown. Its origin is uncertain: ships and submarines have been ruled out, and one hypothesis is that an Antarctic ice plate scraped across rock. A biological source remains possible, but no conclusion is established. Murray Shankar rejects giant squid as a useful explanation, noting that the creatures are barely capable of producing sound at all. The range of proposals, and the explicit absence of a resolution, keep the recording as evidence to investigate rather than a discovery with a known cause.

Comparison without identification

The novel distinguishes resemblance from identification. The URA’s noises are said to resemble the unidentified 1997 spectrograms, while a later playback of a different signal leads the researchers to identify its source as the cloud. That finding does not establish that the cloud produced the older sounds or Slowdown. The records occupy a shared field of investigation, but the text leaves their relationships unresolved.

This uncertainty is set against the limits of human knowledge of the sea. Continental shelves are comparatively familiar and mapped; the depths beyond them are presented as a far less explored environment. At sea, the loss of visual landmarks can make water and sky difficult to distinguish, while darkness and depth further limit observation. In that setting, an old spectrogram can preserve a trace without making its source legible. The 1997 material is therefore valuable precisely as an incomplete record: later instruments can supply a comparison, but not a definitive interpretation.

A record beside later crises

The novel’s later account of methane-hydrate instability offers a contrast to the uncertainty surrounding the 1997 sounds. Mirbach explains that the initial simulation relied on linear assumptions, whereas the real process may be chaotic and exponential: gas released as ice crumbles can crack more hydrates, destabilize the seabed, and bring the system toward a crisis point. She estimates that the time available could be weeks or days, but stresses that the unusual scenario cannot be proved with certainty.

The subsequent collapse is described as a physical chain reaction: worms and bacteria have transformed stable hydrate deposits into brittle material; the hydrates disintegrate, gas breaks through the seabed, and landslides spread along 150 kilometres of slope. The novel does not establish that this event was caused by, or predicted by, the 1997 recordings. Their connection is one of narrative contrast: an acoustic trace invites interpretation, while the later geological disaster makes visible how uncertainty about a complex ocean system can carry immense consequences.

Narrative significance

The year functions as a marker of scientific memory. A signal recorded earlier can acquire new weight when later equipment detects a resemblance, yet the comparison does not erase the gap between observation and explanation. By keeping the 1997 sounds unidentified, the novel resists turning an intriguing parallel into proof. The date points back to evidence that has survived; its meaning remains open.