HBO is airing a documentary on last year’s Chechen terrorist fiasco in a Moscow theater. The documentary premieres tonight at 7 EST with interviews of survivors and highly disturbing footage. With the Chechen suicide squad heavily armed and intent on a massacre, the gassing might have been the only option Russia had to keep the hostages alive, but it remains a tragedy. The type of antiseptic gas used and its side-effects are not discussed at length in the documentary, but they do show the bungled aftermath that left nearly 130 hostages to die in and around the theater.