Despite the grief roiling this earthquake-stricken town, Pablo Cordova has something to be thankful for: He can return the coffin his wife had obtained for his funeral.

The 51-year-old hotel administrator was one of a trickle of survivors pulled from the rubble after Ecuador's strongest earthquake in decades flattened towns along the coast and killed more than 500 people.

Cordova*s wife had given up on ever seeing him again after the five-story Gato de Portoviejo hotel collapsed on him Saturday night, pancaked by the magnitude-7.8 earthquake like the rest of downtown. She asked his boss to buy his casket.

But Cordova held out for 36 hours beneath the rubble, drinking his own urine and praying service would be restored before his cellphone battery died. He was finally able to call his wife on Monday afternoon, and was pulled from the wreckage soon after by a team of rescuers from Colombia.

"They were organizing the funeral, but I've been reborn," Cordova said, grinning from beneath his bushy mustache in a provincial hospital. "I will have to give that coffin back because I still have a long way to go before I die."

On Tuesday, teams from all over the world fanned out across the country's Pacific coastline to look for the dozens of people still missing. Residents joined in with their bare hands, increasingly desperate as the clock for finding survivors runs down.

"Since Saturday, when this country started shaking, I've slept only two hours and haven't stopped working," said Juan Carranza, one of the firefighters leading the rescue effort in Portoviejo.

In the port city of Manta, a group of about 50 rescuers working with trained dogs, hydraulic jacks and a drill managed to free eight people trapped for more than 32 hours in the rubble of a shopping center that was flattened by Saturday night's quake.

While the country cheered videos of such rescues, tragedy continued to mount.

At the same shopping center, authorities were working to free a woman they had found buried alive with a heavy concrete slab pinning her legs when an aftershock forced them to suspend the effort. When they returned the debris pile had moved and the woman was dead, said Angel Moreira, a firefighter coordinating the effort.

The official death toll was raised to 507 in the evening, but there was confusion about the number of missing.

Deputy Interior Minister Diego Fuentes said 2,000 people had been reported as missing to a government registry created to track casualties. But it was not clear if all of those people remain unaccounted for. Earlier, Ecuador's Defense Ministry said 231 people were missing.