Antarctic Bottom Water forms in the Southern Ocean due to interactions between the atmosphere, ice, and ocean. The Weddell Sea plays a key role in this process, with Circumpolar Deep Water entering from the north and circulating as Warm Deep Water. Recent observations show variations in the properties of Warm Deep Water, likely due to changes in inflow and atmospheric conditions. These variations also affect Weddell Sea Bottom Water. The properties of Weddell Sea Deep Water, however, have remained stable. The changes in Warm Deep Water impact the formation of bottom water in the Weddell Sea.