Dangerous sandbars can be deadly. Stay safe out there.

[WillCFish]

I also posted this in the personal craft area because of the likelihood of them getting out on a sand bar.
Have any of you had a sand bar collapse under you?
A friend of mine went under water for half a block when the edge of a sand bar unexpectedly broke off under his weight. It threw him into current and he was lucky to touch bottom so he knew which way was up. He thought he was done for.
https://www.youtube.com/watch?v=jeoGEPy3WOE