Hi @olsfraga
Welcome to the forums!
Unfortunately, we don’t have a value for sound power levels associated with the Ping360 - see this thread.
Since the unit uses about 5 watts, and at least 1-2 watts of that are used by the electronics / converted to heat, that leaves a few watts at most of sound power entering the water. I’ve never been able to hear the unit underwater, even with my ear up against it, due to the high frequency being well outside the range of human hearing…
In short, not a safety concern as far as I can imagine!