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Citizen is one of the leading manufacturers of light-powered quartz watches. Its Eco-Drive system was revolutionary when it debuted in 1995 – for the first time, solar powered watches had been made in which the solar cells could be hidden behind the dial, and thus be virtually invisible. The advantages are obvious: a watch whose design aesthetics and legibility aren't compromised, that doesn't have a battery to go flat. One of the most practical uses of such a system is in tool watches, and with the introduction of the Eco-Drive Professional Diver 1,000M, Citizen's made a light-powered dive watch with the most extreme depth rating yet.
Water pressure at 1,000 meters is extreme. The worst peacetime submarine disaster in U.S. naval history, the loss of the nuclear attack submarine Thresher, occurred at about 700 meters, when the submarine's pressure hull failed during an uncontrolled descent. The submarine's hull imploded in less than a tenth of a second.
https://www.hodinkee.com/articles/citiz ... ar-powered
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