Observation and setting. At Cape Bruguieres Channel in Murujuga, northwestern Australia, divers mapped hundreds of stone artifacts in a shallow channel. The 2020 project paper interprets much of the assemblage as remaining on a land surface submerged by postglacial sea-level rise. The Deep History of Sea Country project was undertaken with the approval of the Murujuga Aboriginal Corporation; sampled cultural material was repatriated, and its Council of Elders and Land and Sea Rangers are named as core collaborators.
Dated material and method. The tools themselves were not directly dated. The proposed minimum age of about 7,000 calibrated years BP comes from when the relevant landscape is thought to have been inundated. It only follows for tools shown to have been deposited before inundation and to have remained in place.
Interpretations and alternatives. observed: stone artifacts in the channel. contested: whether they represent primary pre-inundation deposits or were moved from younger nearby shore sites. Larcombe, Ross and Fandry, Geomorphology (2025) argue from hydrodynamics, erosion and surface sediments that many or all may have been reworked, so the proposed minimum ages do not hold. The original research team responded in Geomorphology (2026), questioning the scale and local validation of the critique's model. We record this as an active disagreement, not a settled “7,000-year-old underwater settlement.”
Next test and care. Seek securely stratified artifacts below intact marine deposits, directly datable material associated with them, and local current and sediment observations able to distinguish the two transport models. Interpret Murujuga Sea Country in partnership with its Traditional Owners; avoid making exact sensitive site coordinates a public browsing feature.