BUENOS AIRES, Argentina (AP) — Trial has begun in Buenos Aires for a group of former pilots who allegedly flew "death flights" for Argentina's dictatorship, during which drugged political prisoners were thrown alive into the sea.

A total of 68 suspects are on trial, charged with participating in hundreds of kidnappings, tortures and murders at the Argentine Navy's largest prison during the dictatorship of 1976 to 1983. It was hidden inside the capital's Naval Mechanics School.

This is the third trial involving the school, and the biggest yet. More than 5,000 political prisoners passed through the clandestine prison. Most killed and made to disappear. The trial that began Wednesday involves a total of 789 victims.