Yes. We've lived on Lake Travis for a couple of years. So far this year there have been 14 deaths in the lake, by drowning. We lived in a cove next to the place where the emergency vehicles (EMS, Firetrucks, Police, LCRA Officials,helicopters, etc) had to go when another boater or swimmer disappeared. These things were going by with their lights and sirens a couple of times a week! Then, invariably, it would be on the news the next day: "Person disappears while swimming and never resurfaces." Not always a boating accident, one 16 year old boy just fell off a private dock and was lost, 3 weeks ago! The creepiest ones go under right in front of their friends. Divers have to search 85 feet blindly (by feel). There are a few unaccounted for, but they usually find them a week later. Could be cold currents drawing them down?
We have been swimming (before we knew better) and we saw a BIG "thing" cut through the water near us, it looked like a guy in a wetsuit, only big. My husband guesses it was a giant garfish. There are some of those & also giant catfish in there. It made us think twice about the safety of this lake. I don't think other lakes are like this.
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And this is definitely real. Look up Austin news reports about drownings at Lake Travis.