Where's the risk if they'll replace any water ingress under the standard warranty? They have no way of knowing if you exceeded 1 meter for 30 min.
I am not sure I'd want to be the person to test this out. If Apple knows the watch is much more water resistant than advertised, I am not sure your water damaged watch would be repaired under warranty. I do wonder if anyone has taken a watch in due to water damage yet though.