Let us hope the horns never sound. But they can -- if they must.
After a routine test that showed them out of commission a month ago, Tsunami warning sirens in San Mateo County are working again, according to the Bay Area News Group.
Five out of the system's eight sirens were out of commission last month.
In addition to working alarms, the new system will also feature the ability to broadcast "voice messages instead of just a warning tone," according to reports.
The sirens will be tested every 12 hours -- including an actual siren wail at 10 a.m. every first Wednesday of the month.