Bruno Lemoine, who runs the cellars of Chateau Larrivet Haut-Brion in the southwest Bordeaux region, asked his barrel-maker chum Pierre-Guillaume Chiberry to build him two small 56-litre wooden barrels in which to age his red wine by an extra six months.

One was to be kept in the chateau cellars, the other sunk underwater among the prized oyster beds of the Bay of Arcachon, north of Bordeaux on the Atlantic coast.

The barrel kept at the chateau was dubbed "Tellus", after the Roman goddess of the land, and the other "Neptune" after the sea god.

Scientists identified two distinct populations of white shark at the east and west of Bass Strait in Australian waters, prompting researchers to suggest the huge fish may need a regional conservation plan.

The study examined tissue samples from 97 sharks collected around Australia since 1989 which were caught in beach safety programs, as fishery bycatch and during Commonwealth Scientific and Industrial Research Organisation (CSIRO) field research. Its findings are broadly consistent with satellite and acoustic tracking research led by CSIRO’s Barry Bruce.