Josh James and a group of about 10 to 15 volunteers from the north Houston area hit the streets Thursday morning as the floodwaters from Tropical Storm Imelda began to rise in Southeast Texas.

James, 28, of Tomball, and the others from the 3P Search & Rescue group had been out in boats assisting and rescuing residents in the Splendora area for about 12 hours when they got a tip.

"We were clearing out a neighborhood when I got contacted on social media from a friend that there was a horse stuck," James said. "We were actually getting ready to dock up for the night," he added.

3P was formed during Hurricane Harvey by a small group of volunteers which operated out of 3P Offroad in Tomball, and eventually grew to a loose network of about 1,000 volunteers with hundreds of trucks and boats in conjunction with the Cajun Navy, James said. Matthew Haynie, who organized the effort in 2017, keep the organization together to be available as needed.

A group of volunteers from 3P Search & Rescue dig out a horse from Tropical Storm Imelda floodwaters in Splendora, Texas on Thursday, Sept. 19, 2019

Media: Houston Chronicle

Other groups were out volunteering as well. Employees from SOS Motorsports in Tomball shut down their shop and had been out all day in the floodwaters helping residents — and they the boat to get out to the house where the horse was stuck. The route was totally inaccessible by road as upwards of 40 inches of rain descended upon the area.

"There were spots that were 11-feet deep that were inaccessible [by truck]. We were going over people's fences. It was nasty in the region," said Catie Waller, who owns SOS Motorsports with her husband Archie.

Working together at the house in Splendora, James, Chris Stephens, Haynie, Jerry Barnett and the Wallers, got to work digging Guy, a 32-year-old former show horse, out of the muck.

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"The horse had already been stuck for about 9 hours by the time we got there," James said.

It was not easy.

"We ended up having to work with him for about 4 hours because we'd dig and it was real soft sediment. Once we got close to getting him out, he'd start thrashing around and just sink even lower," James said.

Video recorded during the rescue shows the crew delicately working to free the horse.

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"Right about four hours we finally got him out," James said, "he was so weak he couldn't even stand on his own."

After an hour or two Guy was able to get up on his own power.

"Just knowing that he stood up and we were able to get him out of the mud hole before it dried and knowing we were able to save his life was extremely rewarding," said Waller, who had previously worked as a veterinary technician.

"He's completely exhausted and wore out but he's one hell of a fighter," James posted on Facebook.