CNN CNN Newsroom April 8, 2014 19:26:00
So it's instant. as soon as it hits the water, it starts pinging. >> it doesn't take a lot of water to activate. it's designed that way. >> so if this were in an airplane, and hit the ocean, this would start immediately, this pinging sound? >> if it was not damaged in the incident. >> reporter: in perfect conditions the pinger's pulse can travel as far as 2 1/2 nautical miles. ocean caverns and cliffs, even vegetation can get in the way limiting that distance, though. before any beacon is shipped from here, its sound output is measured in one of these huge 50,000-gallon tanks. it's lowered int...
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