O Colapso

Five episodes, all shot in one take, five different situations in an escalation. This was so tense it actually gave Chernobyl a match, with much much lesser means. Episode 1 is the weakest, because of the acting, but it already sets the mood : extreme paranoïa, and survival of the fittest! That was quite an achivement in horror in its purest sense. Highly recomended! Edit : Episodes 6-8 are on the same model, but add some interconnectivity between some storylines, to great effect.