(NBC) -- Search crews with the Texas Parks and Wildlife Department are searching Lake Lewisville on Monday morning for a man believed to have drowned Sunday afternoon.
According to the victim's family, they were on the boat just southwest of hidden cove when a family member jumped into the water to cool down. The person was not considered a strong swimmer and was wearing a life jacket, but the boat soon started to drift away from the swimmer's location.
The swimmer's uncle, identified by family members as 38-year-old Michael Quach jumped in without a life jacket to help, but went under the water and never surfaced.
Officials said Monday that divers have had a hard time locating the body and that they're unsure where exactly he went under because of how far the boat drifted.
Officials are using a boat with sonar and a couple of search and rescue boats to try to find the man.
High winds Monday were making the search difficult and the area includes a lot of trees at a depth of up to 30 feet.