Always a pleasure to welcome a new face, here!
As for your question, this is a great classic.
We often sopke about water resistance, here, and there.
To sum it, and to make it short, let's say that this is more a problem of pressure than depth.
It is recommended to not swim with watches which are less than 100 meters WR.
When you swim, your arm " breaks " the water, or when you dive, the pressure of the water is more than 5 ATM.
50 meters WR is a good etancheity, but not for water activities.
Best,
Nicolas