this place is so much history and herheritage, but when the government announced the road at that timethey just think it's tomb stones, just dead people. they don't know so much history inside. >> goh has been called a tomb hunter because of his research. he uses his extensive knowledge of those lying in long forgotten plots. he has already led 50 families to the graves of their ancestors. two years ago, he made headlines when he discovered the maternal graves of singapore's first prime minister. lee kwon yuh. the road project have given rise to a sudden flood of attention for the all but forgotten bu kichkit brown cemetery. free guided tours are offered by volunteers. over 15,000 people have taken part in the walk. today's guide is darren coe, a professor. >> this buried in the traditional grave. for a grave, that's a special thing. if you look carefully at the grave that is prepared for someone of a wealthy background, the peripheral wall has another gully in between before another one. so there a trough here. this trough collects water in the rain, and the water flows from the high