The migratory route taken by Tantalus after departing from Golfo Nuevo demonstrates how the Southern Right Whales utilize the deep ocean basin, one of the most important areas for the females with calves after leaving the breeding grounds of Valdés. Tantalus traveled through the deep waters north of the submerged plateau that connects the Islas Malvinas (Falkland Islands) with the Islas Georgias del Sur (South Georgia), and in the second week of December, she traveled northwards. She is now at the latitude of Peninsula Valdés, but a thousand kilometers (621 miles) eastwards.

Tantalus, like Sulfurium, crossed directly from Peninsula Valdés to the deep waters of the Southwest Atlantic Ocean. From previous seasons tracking whales, we have learned that this feeding site is one of those preferred by adult females. Tantalus is now east of the Blue Hole.

After 39 days of being tracked inside Golfo Nuevo, Tantalus and her calf began their migratory travels to the feeding zones. Traveling along the northeast coast of Golfo Nuevo, she left the gulf heading south. When she arrived at the latitude of the north of Golfo San Jorge, she turned towards the southeast, to arrive at the Blue Hole.

In a manner similar to other mothers with small calves tracked during this season, Tantalus and her calf use the western sector of the Gulf, remaining most of their time in shallow waters.