The solar powered diver’s watch may be the most practical general platform on which to build a dive watch. With light as the primary energy source, and with a ten-month power reserve in total darkness before requiring additional sunlight – and, of course, with 200 meter water resistance (these are, as are all Prospex diver’s watches, fully compliant with the international standard for diver’s watches, ISO 6425) they’re a watch you’d definitely want in your bug-out bag if for whatever of any number of increasingly plausible reasons, civilization as we know it went pear shaped and you had to head for what was left of the hills. These will be available only online, and at $450 they’re yet another reminder (as if we needed one) that over-delivering on toughness, accuracy, and build quality is kind of Seiko’s jam.