Submerged landscape evolution of the Beagle Channel: context of the first record of underwater archaeological evidence

We analyze the finding of a lithic projectile point at more than 100 meters depth in the Beagle Channel (Tierra del Fuego, Argentina) in relation to submerged landscapes. On the one hand, this underwater evidence is examined as part of an inundated archaeological landscape supporting the hypothesized Pleistocene coastal dispersion in southern South America. On the other hand, the lithic projectile point is evaluated as a submerged isolated artefact as the result of human movements through aquatic environments due to foraging and transport practices in the sea during the Holocene. Technological properties and post-depositional modifications of the projectile point are described, and the artefact location is assessed in light of paleogeographic models. The presented evidence does not support an early human occupation in the region, but the particular archaeological detection offers insights to the alternative explanation, and to the potential of underwater explorations in the region.