NMS workers who were digging out the old damaged floor to replace it last week discovered the structure that has aroused the curiosity of archeologists and National Museums of Kenya.
Through Museums Director General Dr Mzalendo Kibunjia, a team of archeologists had been dispatched to conduct a survey to try to uncover the mystery surrounding the concrete cross.
But by the time of going to press, the archeologists were yet to arrive at City Market.
Traders at the market said the cross was covered last week by the same people who made the discovery while digging the courtyard where fishmongers normally ply their trade.