Some time before the great earthquake, which destroyed the fortifications and broke up the penal colony, a gang of convicts, amounting to three hundred, succeeded in liberating themselves from their cells. Unable to endure the cruelties inflicted upon them, they broke loose from their chains, and, rushing upon the guards, murdered the greater part of them, and finally seized the garrison. For several days they held complete possession of the island. A whale-ship, belonging to Nantucket, happening to come in at the time for wood and water, they seized the captain, and compelled him to take on board as many of them as the vessel could contain. About two hundred were put on board. They then threatened the captain and officers with instant death in case of any failure to land them on the coast of Peru, whither they determined to go in order to escape the vengeance of the Chilian government. Desirous of getting rid of them as soon as possible, the captain of the whaler ran over for the first land on the coast of Chili, where he put them ashore, leaving them ignorant of their position until they were unable to regain the vessel. They soon discovered that they were only thirty miles from Valparaiso; but, short as the distance was from the Chilian authorities, they evaded all attempts to capture them, and eventually joined the Peruvian army, which was then advancing upon Santiago. The remainder of the prisoners left upon the island escaped in different vessels, and were scattered over various parts of the world. Only a few of the entire number engaged in the massacre were ever captured; sentence of death was passed upon them, and they were shot in the public plaza of Santiago.