Forget about diving in Buenos Aires. The city is by the River Plate (Rio de la Plata), which is a mud soup. The closest diving you can try is in Mar del Plata, 400 km south of Buenos Aires, and the diving there is so-so.
If you have time, go to Puerto Madryn. This is 1,500 km south of BA, and the diving there could be spectacular. They have one of the largest sea lion & sea elephant colonies in the world, and depending the time of the year that you go, you are almost guarantied a dive with Right whales. There also several wrecks around there. Don’t remember their depth. Although summer just finished down there, you need AT LEAST 5mm wet suit.
ORCAS Every year since 1976, the arrival of Transient / Resident Orcas to the Peninsula Valdez has been observed.
The Orcas patrol along the steep pebble coastline of Punta Norte, listening to the young seals, only a few weeks old, as they play in the water or cross from one colony to the next.
See
website Facts about Orcas
It is in Argentina- Orcas is in the Atlantic (South).
- The typical depth is 0-30 Metres 0-100 Feet.
- The typical visibility is 0-3 Metres 0-10 Feet.