When I was there in 1991, I asked the driver to take me to La Escuela Mecanica de la Armada, which was a notorious concentration point during the three-term junta. The navy was particularly involved in the disappearances of thousands of “subversives”. The taxi driver was nervous, so I just snapped a few pics and we drove back to Recoleta.
I recall that the navy used to fly prisoners in helicopters over the bay and throw them out. Pretty brutal times.