https://www.flightradar24.com/

Free app for tracking flights; can be configured to give an alert whenever any aircraft worldwide squawks a 7700 emergency.

Until the "VAX" era, you might get three or four of those per month.

Today, I typically see that many PER DAY.

Note: a 7700 squawk doesn't necessarily mean the pilot or anyone else is personally in distress; the aircraft could have a mechanical failure, for instance.

What does Squawking 7700 mean? (from AviationMatters.co)

7700 is a squawk code that is reserved for emergency situations and immediately alerts Air Traffic Control (ATC) and other units that the aircraft squawking 7700 is in distress. It may be assigned by Air Traffic Control or the pilots may decide to enter it into their transponder themselves.