You may remember the MTM Black Seal from an article we did last month on extreme dive watches. The most notable feature is the fact that it's completely waterproof. What's the difference between being waterproof and water resistant? The easiest way to explain it is that the MTM Black Seal is completely unambiguous in its claims regarding water and pressure resistance: the Black Seal has been proven in a Swiss laboratory to remain fully intact at the deepest known point on earth, the Mariana Trench, which is about 12,000 meters, or about 39,370 feet.

MTM's secret is the silicon oil filled case which is designed to equalize the pressure exerted on the watch in a way which makes it virtually compression-proof. There are a few other watches out there which make the same claim, but none with quite the unique feature set of the MTM Black Seal.

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This model comes in a choice of dial colors (blue, black, orange, silver, and yellow), and is outfitted with a mineral crystal. Something that sets the Abyss apart from the other extreme divers is the day of the week in additional to the date. Like all the extreme divers, the case of the Abyss is filled with silicone oil to keep the pressure equalized, and it has a very prominent air bubble which will undoubtedly draw bewildered looks and plenty of questions from perfect strangers.

If you want a watch that you can see at anytime during the night, or if you work for long periods of time in a darkened environment, or if want a watch that you can use for night diving, you probably want tritium. I'm an amateur diver, so I don't need hardcore equipment, but I really like being able to wake up at any time during the night and easily read the time. It's worth noting that the MTM Black Seal actually uses a combination of tritium and some sort of luminescent material, as well. The tritium tubes are used for the indices and hour and minute hands, and the luminescent material is used for the numbers which means initially, you can see everything in the dark, but over time, only the indices and hands are visible (which is really all you need).

The MTM Black Seal is a big watch. With a 44 mm case and weighing in at 7.5 oz (about 2.5 ounces heavier than the bulky Rolex Sea-Dweller), it's a serious piece of equipment. That said, I have relatively narrow wrists, and somehow, I've been able to get away with wearing the Black Seal. The shape of the case and lugs bends nicely along the curve of my wrist which allows it to sit very comfortably in place, wearing much lighter than it actually is. And of course the Velcro strap reduces the weight considerably, as well.

I really like the fact that the MTM Black Seal uses hex screws for the bracelet links, and to attach the bracelet to the lugs. Three hex keys are included with the watch which makes it very easy to size yourself, and the spring bar micro adjuster lets you further refine the fit. I would love to see other stainless steel bracelets adopt a system like MTM's. Why should people have to bring their watches in to a jeweler to get adjusted? The hex screws make the bracelet easy to size, strong, and in my opinion, lend it a unique and tough look.

We now head north from Switzerland (or at least Swiss made) to Germany where the Sinn UX is a serious extreme diver contender. The silicon oil filled Sinn UX is certified to 12,000 meters (39,000 feet) and is built from steel designed for submarines which is five times harder than regular stainless steel.

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