How do I turn off random sounds on my MacBook Pro?

TortiePlusWhite wrote:

This is not a huge deal, but curiously, my MacBook Pro (14-in, Nov 2023, M3 Pro Chip, Sequoia 15.3.1) began making a single sound (possibly "Submerge") each day at 9:10 am. Unfortunately, I'm not sure exactly when it started. I didn't intentionally set it up. Any ideas why this happened? How to turn it off? Thank you!

[Re-Titled by Moderator]

hmmm... each day at 9:10 am does not sound random

Look at your Calendar.app

I would check and see if this is an All Day Calendar event notification sound(?)

you can turn off in Notifications>Calendar

if you are sharing Notifications with your iPhone/iPad(?)

Settings>Sounds> Calendar Alerts(?) Reminders Alerts(?)

Settings>Notifications (?)