Clocks, true.
Computer systems in general, however, will start acting very squirrelly outside of an approved MHz range. Wall warts and power supplies can handle only so much deviation from the norm. It’s why high-end UPS systems do power conditioning to provide a pure sine wave.
Buried lines of all kinds are frequently severed by excavators because their position isn’t properly or fully documented.
The best set up I ever saw was a sewer tunnel, almost 12 feet tall, that handled all the services. From sewage to water to electricity to data; it held everything and was trivial to maintain and run new lines in.