Rescue teams used underground cameras and sniffer dogs Wednesday to search for nearly 40 construction workers still missing in rubble two days after the collapse of an apartment building under construction in coastal South Africa.

Relatives of 44 construction workers trapped under a collapsed building in the South African city of George faced a fourth day of anguished waiting on Thursday as heavy machinery worked at the site in a race against time to find any survivors.

A couple has shared their joy with the BBC after their son was rescued from under the rubble of a building that collapsed on Monday in the South African coastal city of George. Delvin Safers is among 29 survivors who have been freed as rescue-and-search operations continue for a third day to find 39 people who are still unaccounted for.

Moses Malala, a 34-year-old construction worker who escaped the wreckage of a five-storey building in George, South Africa, recalled the moment it collapsed and a cloud of dust engulfed him, as rescue efforts continued at the site 48 hours on.