And of course there are deep sea divers, which still rely on mechanic (aut-windup) watches. Mostly Rolex. There's a reason for that: If you dive in 60 metres d

And of course there are deep sea divers, which still rely on mechanic (aut-windup) watches. Mostly Rolex. There's a reason for that: If you dive in 60 metres depth, or deeper and your dive computer -, or watch battery conks out you're dead.