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Alvin's new Green LED light (penetrates water better), and red lasers.

Lighting Up the Abyss

A new light-emitting diode (LED) system—built by Deep Sea Power & Light—was recently tested on the Alvin submersible during engineering dives in June off San Diego. The green lights appear to help pilots when the water is murky with particulate matter; the light does not necessarily penetrate farther, but there is less reflection than with white lights. The LEDs use about one-tenth of the power consumed by traditional Xenon, leaving more battery power for other things. (Photo by Anton Zafereo, Woods Hole Oceanographic Institution)

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