As far as I know there is a danger of swimming into "climbing plants/creebers" in lakes. This can bring you in an extremely dangerous situation where you tangle up more and more cause you panic.
Am I able to avoid swimming into these? How should I react if I get stuck?
It's quite tough for me to give an exact reference to a particular plant. They mostly grow on the ground of lakes and have kind of tentacles. They might tangle around your knuckles and if you react jerkily you'll be tangled up more an more.
This is a picture like a locale newspaper (a report where a 26 year old man was "tangled to death") has illustrated it:
Sadly I don't know if they're accurate or random stock-photos.