Started at Pampa Linda and took trail to Carabineros hut on South side of Tronador. Be prepared with river crossing footwear for this trail. Accessed camp 1 via south ridge and stayed at 1st snow bowl. Hiked to high camp at Refugio Viejo via snow fields on South side of Tronador. If leaving camp early, have crampons and ice axe strapped on. Spent three days doing skills, while waiting for weather window (hiked as a part of a training) on glacier at Refugio Viejo. Summit day was smooth, with some route finding through crevasses below the col which access pico international and argentina (high danger of serac falls here). Access to summit from col saw 40 degree snow and 45 degree ice with bad runout (100ft fall on seracs). Fixed lines were used to decrease danger potential. Started day at 3am and returned to camp at 5pm (waited for slower party at summit bottleneck and serac fall in col). Descended following day via Refugio Otto Meiling and trail to Pampa Linda. Much route finding through crevasse field this day (rope travel recommended).