Both models are Bathyscaphes with unusual color schemes. 

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In the event that diving watches had a uniform, the case would be stainless steel and the dial would be blue. There is absolutely nothing wrong with that, of course, but Blancpain has decided that its two new Fifty Fathoms Bathyscaphe models, the Day Date '70s "Desert" and the Flyback Chronograph "Green," are destined to shake up the aesthetic status quo of the genre.

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Desert-themed watches, with beige dials and sand-colored sail canvas straps, seem to contradict the whole concept of diving. How do you dive in the desert?

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As Blancpain explains, the model was inspired by underwater photographer Ernest H. Brooks II's 1962 dive at Devils Hole, a gap in Death Valley National Park that houses the sole population of the endangered Devils Hole Pupfish in an underwater aquifer.

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A 1970s dive watch from the watchmaker's archives was used as inspiration for the design, which included a gradient-colored dial, a date window at 3 o'clock, and a day-of-the-week window. Blancpain uses an ultra-modern 1315DD movement with a five-day power reserve and silicon balance spring to produce a timepiece with greater accuracy and magnetic field resistance.

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With a 43 mm satin-brushed steel case, the new day-date model is housed in a limited edition of 500 pieces that are each priced at $12,700 and is available in a limited edition of 500 pieces.

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There are two stages to polishing the flyback chronograph's dial. The first stage is to remove any scratches and, secondly, to ensure a smooth appearance. The dial is bathed in a singular shade of green that looks metallic from certain angles. Afterwards, Blancpain’s dial specialists devote their time and effort to creating the distinctive sunray effect you see on the finished product, as well as the texture visible in the finished product. A shimmery green dial has been created as a result of a series of coatings of material, each of which is designed to produce a different hue depending on what angle of illumination the dial is shown in.

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The self-winding high-frequency chronograph movement of the model is visible through a sapphire crystal caseback and features a vertical clutch and column wheel. When pressed at 4 o'clock, the flyback function allows the wearer to restart the watch instantly.

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$17,200 is the retail price of this model, which features a 43.6 mm satin-brushed black ceramic case with a rotating bezel adorned with green ceramic inserts.

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A nearly seven-decade association with diving has led Blancpain to develop both models. Originally designed for an elite squad of underwater commandos, the 1953 Fifty Fathoms was often referred to as the first modern dive watch. During the past few decades, the brand has been a key player in transforming dive watches into pillars of sport watches.