The cable is owned by AT&T but leased to Verizon.
The San Jose Mercury News :
It appears somebody opened a manhole in South San Jose, climbed down 8 to 10 feet and cut four or five fiber-optic cables.
The outage is affecting cell phones, land lines and Internet access for Verizon customers in Morgan Hill, Gilroy, San Martin and Santa Cruz County.
"Verizon is completely down; other carriers are intermittent at best," said a spokesman for Santa Clara County. There is no timetable for the service to return.