An eyewitness told CNN what happened when flood waters swept away the elderly man's SUV on Tuesday.
Maritza Castillo, her husband and and dozens of other drivers who were stuck in traffic on the "submerged" Interstate-10 in Houston rushed to help immediately.
But, they had no ropes. "Somebody said, 'Let's form a chain,'" Ms Castillo told CNN. And so, that's exactly what they did.
Another eyewitness, Stephanie Edward Mata, was on the other side of the flooded road filming the daring rescue.
"The people had no rope to get him out so they made a chain holding each other," she told Mashable.
Arms linked, they inched slowly towards the vehicle in the fast-flowing water.
"They pulled the door open and one gentleman got ahold of him as they held on until they got him safe," Ms Mata explained.
Watch how the dramatic rescue unfolded below:
ABC 13 Houston posted a heartwarming photo of the rescue on Twitter, writing: "#Harvey has taken a lot, but it will NEVER take our humanity. We have seen so many neighbors helping each other. THANK YOU #HopeForHouston."
And Twitter was all praise for the good Samaritans:
Houston, you rock. Your community spirit in the face of such great loss has given me back a little hope and some faith in my fellow humans.— WeAreAllTexansToday (@JamieTFox) August 30, 2017
Awesome display of the best humanity has to offer. Beautiful.— Liza (@DrivesouthLiza) August 30, 2017
I love people. 99% are just good human beings when given the opportunity.— lnordstrom (@lnordstrom123) August 30, 2017
Hurricane Harvey made landfall during the weekend as a monster Category Four hurricane and later weakened to a tropical storm. The rain has led to severe flooding in parts of the state and left large parts of Houston - America's fourth largest city - underwater.
On Wednesday, a dramatic video posted on Facebook by the United States Coast Guard showed how a mother and her child were airlifted to safety from rising flood waters.Click for more trending news