SOUTH LAKE TAHOE, Calif. (AP) - An unmanned submarine designed to explore earthquake faults has run into motor problems during a test at Lake Tahoe.
The Los Angeles Times says the sub was supposed to dive more than 1,000 feet under the Sierra Nevada lake earlier this month but problems cropped up during shallower test dives.
Gordon Seitz with the California Geological Survey says engineers were still able to test the sub's remote controls, cameras, measuring laser and other equipment.
They're hoping for another test run next spring.
The 28-foot-long sub is designed to explore under the Antarctic ice. The Lake Tahoe tests will explore a fault that experts say could produce a quake with a magnitude of 7.1 to 7.4.
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