Antarctic Bottom Water forms in the Southern Ocean due to interactions between the atmosphere, ice, and ocean. The Weddell Sea plays a major role in this process, with Circumpolar Deep Water circulating as Warm Deep Water within a large gyre. Recent observations show variations in the properties of Warm Deep Water, likely due to changes in inflow and atmospheric conditions. The properties of Weddell Sea Deep Water have remained stable, but Weddell Sea Bottom Water has undergone significant changes. These variations are linked to the formation process of bottom water.