Swiss watchmakers love nothing more than doing things just to prove they can be done. The new Blancpain Bathyscaphe Quantième Complet Phases de Lune, a professional-spec diver’s watch with a dial that displays the time, day, date, and phases of the moon, is a perfect example of the lengths they’ll go to push the envelope. The watch (like every other Blancpain Bathyscaphe) is rated to 300 metres underwater, a depth that only a few of the most serious divers will ever visit, and the standard for high-end diver’s watches.