NST City, SouthamptonGbolahan Obisesan's retelling of a disaster in which more than 600 South Africans died is poignantly beautiful and sharply angryZamile Gantana takes a crate, sits in the middle of the stage, and gives a straightforward but lyrical explanation of what happened to the SS Mendi. In 1917, a total of 823 South African men boarded the ship to aid the British war effort; a month later, more than 600 of …