Sea Level has regularly changed every 100, 000 years by up to 400 feet (130 m), in concert with the regular ice ages over the last three million years.

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"I went to school in Radyr, and my wife's from Brecon, so my feet are firmly in Wales - I was always a regular in the hotspots of Cardiff, " he said.

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Still, it feels solid enough for regular use, and thanks to waterproofing down to 50 meters (164 feet), it can stay on your wrist during laps in the pool (or in the ocean), and it'll work just fine in the shower as well.

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