What does the chorus mean by referring to a wedding chamber?
In Scene IV the chorus states that the tomb she will die in will be her 'wedding chamber' which is a reference the Antigone being the Bride of Death/Hades. This is a metaphor connecting Antigone to the story of Hades and Persephone. Later Antigone compares herself to Niobe, a tragic Greek figure and past queen of Thebes, who mocked the gods and was punished. Her children were killed and left unburried (connection to Antigone's brother) but the gods took pity and eventually burried them (Creon eventually righted his wrongs and tried to free Antigone, but was too late). Poor Niobe was turned to stone and is seen eternally weeping on Mt Sipylus. Antigone was sent to a 'rock tomb' or 'caverned rock' much like the vault of stone that Niobe was turned into.