By late afternoon, the 44-year-priest had blessed about 50 corpses in the remains of this Philippine shattered city.
He then returned to his half-destroyed Santo Nino church and led Mass. Today, Alvero was again overseeing worship at the peach-colored building, leading services for hundreds of survivors of one of the worst storms on record.
"Despite what happened, we still believe in God," he said.
"The church may have been destroyed, but our faith is intact, as believers, as a people of God, our faith has not been destroyed."
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It was one of dozens of churches across the region holding services that were attended by thousands, many homeless and grieving. More than 80 per cent of the 90 million people in the Philippines are Roman Catholic, the largest in Asia by far and a legacy of its history of Spanish colonial rule.
"Coming to Mass gives people hope that things will eventually get better," said Marino Caintic.
Also today, the country's president, Benigno S. Aquino III, visited the two hardest-hit islands, Leyte and Samar.
Aquino, who has faced a succession of crises over the last year, is facing criticism in some quarters over the administration's preparation for the typhoon, as well as its response.
Tacloban, a city of 220,000 people, was largely leveled by the November 7 typhoon.
Alvero carried on his work until the fifth day, blessing bodies wherever they lay in smashed cars or floating in water. He stopped when the smell became too much for him, though he said other priests have continued doing so.
"We are being tested by God, to see how strong our faith is, to see if our faith is true," he said. "He wants to know that we have faith in him in good times, as well as in bad."
Santo Nino and other churches have also been helping care for those who survived.