CREATE TABLE table_68771 ("Estimate" CLOB, "Name" CLOB, "Nat." CLOB, "Ship type" CLOB, "Where sunk" CLOB, "Date" CLOB)

What is the date that a ship sank in the South Atlantic?
SELECT "Date" FROM table_68771 WHERE "Where sunk" = 'south atlantic'
SELECT "Date" FROM "table_68771" WHERE "Where sunk" = 'south atlantic'