the twentieth century it continued its progression, managing to close its arm for the first time in 1917, followed by the first break. Sudden discharge ruptures In the 21st century, the events of 2004, 2006, 2008 and 2012 are classified as sudden download events. In 2004, the peak level of the dammed lake was 10.5 m and discharge flow peak had a value of 5000 m³ / s, finishing with matching lake levels after four days. It was estimated that 10,000 tourists watched this event. In 2006 the level difference reached by the Rico arm was 5.4 m and on 10 March, the retained water began to escape, which caused the dike to collapse on the 13th. The discharge rate rose to 5850 m³ / s, concluding the discharge period on March 14, when the levels of the Rico arm matched the rest of the lake. In the 2008 event, the discharge flow had a peak value of 8000 m³ / s, finishing with matching lake levels after about four days. At the 2012 event, the discharge flow peak had a value lower than the previous ones, 2000 m³ / s, so it took longer to evacuate the accumulated water, concluding only after 14 days. Progressive discharge ruptures In progressive unloading events the whole process slows down, although an ice set-up occurs. In the southern summer of 2013 there was an event of this type. By September 9, 2012, the front of the glacier had shortened the distance that separated it from the coast of the Magallanes peninsula to only 30 meters, which had caused the Rico arm to accumulate water, reaching a maximum level of 2.2 m on November 21, when the water managed to overcome the ice wall by opening a subglacial tunnel, beginning the discharge process. Tunnel formation was visible directly on day 26 and subsequently the tunnel collapsed. On February 4, 2013, the discharge flow reached a maximum value: 205 m³ / s. The discharge continued, albeit in a very slow way, as a result of new semi-clogging, so it was just completed, when both levels were the same, 85 days after it started. The distance between the glacier wall and the peninsula was over 100 m towards the beginning of March. At the end of December 2013 there was another event of the progressive type with similar characteristics to what had happened the previous year.