[arethuza]

And shallower - when my son did rowing for a while on the Union canal they were told that if they capsized to simply "stand up"...

[jodrellblank]

There was a big canal bank collapse in December, and you can see in news photos the drained bits of the canal around the hole. The boats sitting on the canal bed are barely lower than they are normally when floating. Looks like 4 feet deep.

https://www.bbc.co.uk/news/articles/c2lvq0yk9dko