Inside the Houston convention center where Harvey evacuees are double the capacity

PHOTO: People sleep on the floor at the George R. Brown Convention Center that has been set up as a shelter for evacuees escaping the floodwaters from Hurricane Harvey in Houston, Aug. 29, 2017. PlayLM Otero/AP
WATCH Volunteers rescue Hurricane Harvey victims, evacuation centers fill up

After thousands of Hurricane Harvey evacuees streamed in by the busload to Houston's George R. Brown Convention Center, the shelter has now swelled to over double its capacity.

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As of Tuesday afternoon, there were more than 10,000 people living at the convention center in downtown Houston.

The Red Cross had planned for 5,000 people.

With only 5,000 cots, nearly half of the evacuees are sleeping on the cold tile floor of the 2-million-square-foot convention center that includes exhibit halls, meeting rooms, a ballroom and a 3,600-seat amphitheater.

Officials are working to ensure enough cots are provided, as well as attempting to reduce the population at the convention center, Houston Mayor Sylvester Turner said in a press conference Tuesday evening.

The Toyota Center will be used as an additional shelter to help ease the number of people at the convention center, Turner said. Residents seeking shelter will need to go through the George R. Brown Convention Center first, though, Turner said.

PHOTO: Evacuees fill up cots at the George Brown Convention Center that has been turned into a shelter run by the American Red Cross to house victims of Hurricane Harvey, Aug. 28, 2017, in Houston.Erich Schlegel/Getty Images
Evacuees fill up cots at the George Brown Convention Center that has been turned into a shelter run by the American Red Cross to house victims of Hurricane Harvey, Aug. 28, 2017, in Houston.

Even though the conditions are imperfect, those inside are safe, dry and more, importantly, out of the danger zone.

The relocation comes after Hurricane Harvey, which has since been downgraded to a tropical storm, tore through the Houston area this weekend, causing at least nine deaths, forcing evacuations and wiping out homes. The National Weather Service deemed the flooding "epic and catastrophic" and Texas Gov. Greg Abbot said the aftermath of Harvey will likely be "horrific" and leave behind a mess that will "take years" to rebuild.

Slideshow: Gulf Coast residents struggle to recover after Hurricane Harvey
SLIDESHOW: Slideshow: Gulf Coast residents struggle to recover after Hurricane Harvey

Some evacuees sheltering at the convention center, which is among the 10 largest in the United States, told ABC News they lost everything.

At times there are long lines of people arriving at the shelter, tired, waterlogged and some still in shock.

The convention space has electricity and warm water, an emergency room and a large food station serving warm meals.

PHOTO: People wait to be checked by police before entering a shelter in the George R. Brown Convention Center during the aftermath of Hurricane Harvey, Aug. 28, 2017, in Houston.Brendan Smialowski/AFP/Getty Images
People wait to be checked by police before entering a shelter in the George R. Brown Convention Center during the aftermath of Hurricane Harvey, Aug. 28, 2017, in Houston.

PHOTO: A vet holds a dog at a shelter in the George R. Brown Convention Center during the aftermath of Hurricane Harvey, Aug. 28, 2017, in Houston.AFP/Getty Images
A vet holds a dog at a shelter in the George R. Brown Convention Center during the aftermath of Hurricane Harvey, Aug. 28, 2017, in Houston.

There is a big police presence to keep the peace but the center appears to be running smoothly, without chaos.

Lots of families with babies are gathered inside, as well as individuals with special needs.

After an elderly woman wearing only a T-shirt begged for a pair of pants, the Red Cross quickly assisted her.

An 18-year-old mother from northeast Houston at the shelter told ABC News she was rescued by helicopter with her child and three of her nephews. Staying behind in a house, and still apparently trapped, are her brother and other relatives.

During the flooding, she thought she and her little boy were going to die, she said, and she's still afraid for her family.

By herself with four children, she chose to sleep on the carpet outside the entrance to the convention floor. She says it's warmer and easier for the small children.

Another Houston resident who is volunteering her time at the center's baby station broke down to ABC News, tearfully explaining stories of mothers’ arriving at the shelter, some with babies as young as 2-weeks-old.

She said some women have gone into labor inside the convention center. They did not have enough baby supplies Monday, she said, but have since received several donations that helped a lot.

PHOTO: Volunteers sort through donated clothing at a shelter in the George R. Brown Convention Center during the aftermath of Hurricane Harvey, Aug. 28, 2017, in Houston.Brendan Smialowski/AFP/Getty Images
Volunteers sort through donated clothing at a shelter in the George R. Brown Convention Center during the aftermath of Hurricane Harvey, Aug. 28, 2017, in Houston.

An official said Monday the center was looking for more volunteers, especially mental health specialists, nurses and social workers. One volunteer told ABC News Monday he had been working since the shelter opened. He said he hadn't stopped to sleep, instead checking people in and offering them towels.

PHOTO: Volunteers with The American Red Cross register evacuees at the George R. Brown Convention Center after Hurricane Harvey inundated the Texas Gulf coast with rain causing widespread flooding, in Houston, Aug. 28, 2017.Nick Oxford/Reuters
Volunteers with The American Red Cross register evacuees at the George R. Brown Convention Center after Hurricane Harvey inundated the Texas Gulf coast with rain causing widespread flooding, in Houston, Aug. 28, 2017.

A long line of cars formed Monday outside the convention center, where people are coming to deliver supplies and cheer the evacuees.

One man delivered supplies dressed up in full costume as "Batman," and his 4-year old son joined him, dressed up as "Little Batman." The young and elderly stopped and smiled at the duo, who brought clothes and activity packs to the children at the convention center.

"The people of Houston need a hero," Batman told ABC News.

Added Little Batman: "It was my idea.”

Houston officials say they are preliminary looking into possibly opening other large, long-term shelters.

ABC News' Lana Zak contributed to this report.

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