https://en.wikipedia.org/wiki/History_of_New_South_Wales
From 1788-1792, it started out tough with thousands of professional criminals ill-fitted for the skills required. 1/4 of the 2nd fleet lost their lives. The rest survived near starvation. However, between 1810-1821, it transitioned from a penal colony to a budding free society.
I can't think of many successes like that in our history where so many career criminals were reformed so quickly, the sacrifices of lives not withstanding.