Getting sucked into a sieve, strainer, cave, or undercut is an easy way to die. I found this unbelievable footage of a paddler going through a cave. As a kayaker this was incredibly useful to me for understanding the dynamics and decision making processes necessary to stay safe.
Note that I do not own the footage in this video. I do not make any claim of copyright. The original can be found here:
https://www.youtube.com/watch?v=RuDslzKZhXI
The music in the intro is Danheim: https://danheim.bandcamp.com/
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