It’s the fifth day (Monday) after the collapse of a condo building close to Surfside, Miami. The search for survivors is still ongoing as Rescue workers spot voids.

The rescue teams who were digging very carefully stressed that they could still find survivors in the rubble of the collapsed Florida condo building, a hope family members clung to even though no one has been pulled out alive since the first hours after the structure fell.

So far, a total of nine persons have been brought out dead. But more than 150 people are still missing in Surfside. Their families rode buses to a site close enough to watch the intense rescue effort, including firefighters, sniffer dogs, and search experts employing radar and sonar devices.

Early Monday, a crane lifted a large slab of concrete from the debris pile, enabling about 30 rescuers in hard hats to move in and carry smaller pieces of debris into red buckets, which are emptied into a larger bin for a crane to remove. The work has been complicated by intermittent rain showers moving through the area, but at least the fires that hampered the initial search have been extinguished.

Andy Alvarez, a deputy incident commander with Miami-Dade Fire Rescue, told ABC’s “Good Morning America” on Monday that rescuers have been able to find some voids inside the wreckage, mostly in the basement and parking garage areas.

We have over 80 rescuers at a time that are breaching the walls that collapsed, in a frantic effort to try to rescue those that are still viable and to get to those voids that we typically know exist in these buildings,” Alvarez said.

“We have been able to tunnel through the building,” Alvarez added. “This is a frantic search to seek that hope, that miracle, to see who we can bring out of this building alive.”

He said rescuers, like the families, are still hoping for good news. “You’ve gotta have hope and you’ve gotta have faith,” he said.

Others who have seen the wreckage up close were daunted by the task ahead. Alfredo Lopez, who lived with his wife in a 6th-floor corner apartment and narrowly escaped disaster, said he finds it hard to believe anyone is alive in the rubble.

“I just can’t see anybody, you know – I hope to God that they’re going to find somebody, but man, you know, if you saw what I saw: nothingness and then, you go over there and you see, like, all the rubble. How can somebody survive that?” Lopez told The Associated Press.

Israeli Diaspora Affairs Minister Nachman Shai, head of a humanitarian delegation from Israel that includes several search-and-rescue experts, said the professionals have told him of cases where survivors were found after 100 hours or more.

“So don’t lose hope, that’s what I would say,” he said.

Some families had hoped their visit to the site near the 12-story building would enable them to shout messages to loved ones possibly buried deep inside the pile. As they returned to a nearby hotel, several paused to embrace as they got off the bus. Others walked slowly with arms around each other back to the hotel entrance.

“We are just waiting for answers. That’s what we want,” said Dianne Ohayon, whose parents, Myriam and Arnie Notkin, were in the building. “It’s hard to go through these long days and we haven’t gotten any answers yet.”

The building collapsed just days before a deadline for condo owners to start making steep payments toward more than $9 million in repairs that had been recommended nearly three years earlier, in a report that warned of “major structural damage.”

On Sunday, authorities identified the additional four people that had been recovered as Leon Oliwkowicz, 80, and his wife Christina Beatriz Elvira Oliwkowicz, 74; and Ana Ortiz, 46, and her son Luis Bermudez, 26. The number of people left unaccounted for was 152, said Miami-Dade Mayor Daniella Levine Cava. The last live person rescued was on Thursday, just hours after the collapse.

Miami-Dade Assistant Fire Chief Raide Jadallah explained that conditions at the site — the building pancaked when it fell — have frustrated crews looking for survivors. Alan Cominsky, chief of the Miami-Dade Fire Rescue Department, said his team is holding out hope of finding someone alive but must continue to move slowly and methodically.

“The debris field is scattered throughout, and it’s compact, extremely compact,” he said, noting that teams must stabilize and shore up debris as they go.

“We can’t just go in and move things erratically, because that’s going to have the worst outcome possible,” he said.

Among the tools rescuers used was a microwave radar device developed by NASA’s Jet Propulsion Lab and the Department of Homeland Security that “sees” through up to 8 inches (20 centimeters) of solid concrete, according to Adrian Garulay, CEO of Spec Ops Group, which sells them. The suitcase-size device can detect human respiration and heartbeats and be being deployed Sunday by a seven-member search-and-rescue team from Mexico’s Jewish community.

Levine Cava said six to eight teams are actively searching the pile at any given time, with hundreds of team members on standby ready to rotate in. She said teams have worked around the clock since Thursday, and there was no lack of personnel.

President Joe Biden said in a statement he spoke with FEMA Administrator Deanne Criswell about efforts on the ground after Criswell visited the site. Biden said his administration is prepared to provide assistance and support.

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“This is an unimaginably difficult time for the families enduring this tragedy,” Biden said. “My heart goes out to every single person suffering during this awful moment.”

Crews spent Saturday night digging a trench that stretches 125 feet long, 20 feet across, and 40 feet deep (38 meters long, 6 meters across, and 12 meters deep), which, she said, allowed them to find more bodies and human remains.

Earl Tilton, who runs a search-and-rescue consulting firm in North Carolina, said rushing into the rubble without careful planning and execution would injure or kill rescuers and the people they are trying to save.

“Moving the wrong piece of debris at the wrong time could cause it to fall” on workers and crush them, he said.

But Tilton agreed families were not wrong to continue holding out hope. During past urban rescues, he said, rescuers, have found survivors as long as a week past the initial catastrophe.