Authorities in China are trying to reach three men trapped underground after the rail tunnel they were working on collapsed.
Despite being cut off for more than a week, they have been in touch with their rescuers, sending out footage of themselves as they try to dig their way out.
The plan to rescue them is to widen a narrow water pipe that runs below the collapsed tunnel .
The authorities have co-ordinated their digging with the trapped men so that they reach each other in the next two days.
Al Jazeera's Dominic Kane reports.