In Buenos Aires there is no place to dive. The nearest point is a pond in Tandil, an old granite mine to open sky, some 350 km away from Buenos Aires. Further away the nearest sea diving is in Las Grutas, where you can find some nice wreck diving. A few kilometers more, you will find Puerto Madryn with a lot of dive operators. Wreck diving and sea lions diving. Also in Bariloche and the nearby lakes you can dive those beautiful melted ice lakes. For the dates you mentioned, it's going to be the end of Autumn, so you will need a drysuit. Drysuits can be rented in Puerto Madryn, though you usually have to book with plenty of time to be sure a drysuit for your size is available.
For Tandil, please visit contact Hernan Rodriguez. He is running the operations in the Tandil pond.
For Las Grutas, please contact Cota Cero Buceo. The are the only operator in Las Grutas.
For Puerto Madryn, please contact Scuba Duba Buceo. I guess they are the best there.
For Bariloche, there are also many operators. Maybe Alfredo Ciunfrini is the one to contact.
Language could be a barrier. If you cannot speak spanish, It could be a little hard.
For Tandil, please visit contact Hernan Rodriguez. He is running the operations in the Tandil pond.
For Las Grutas, please contact Cota Cero Buceo. The are the only operator in Las Grutas.
For Puerto Madryn, please contact Scuba Duba Buceo. I guess they are the best there.
For Bariloche, there are also many operators. Maybe Alfredo Ciunfrini is the one to contact.
Language could be a barrier. If you cannot speak spanish, It could be a little hard.