Extreme Dive Watches from TechnoMarine, Bell & Ross, MTM, and Sinn

A seven-year battery, thick anti-reflective sapphire crystal, German engineering, and a stark and understated professional look make the UX stand out in the extreme diver lineup. (For more details on the Sinn UX, see Introduction to Sinn: a Convergence of Watch*** and Engineering.)That's four watches that are nearly impervious to pressure. For the typical desk-diver, these are extremely interesting the best ugg that will entertain friends, family, and perfect strangers as you explain every last feature and nuance. For the ugg collector, some sort of over-engineered diver is a must, so why not one-up your fellow collectors and make it an extreme diver? And for the serious diving professional, God help you if you should ever end up deep enough to put any of these watches to the test.The MTM Black SealNext up is the MTM Black Seal (read the full review here). This one is defiantly worth a few minutes of your time. With an oil-filled case, the MTM Black Seal claims to be completely waterproof to 12,000 meters (39,000 feet), and even adds some interesting features like a high-end Swiss quartz movement, a sapphire crystal (much harder then the mineral crystal found on the Abyss), and Tritium-filled glass tubes on all the markers. Tritium gas is electro-phosphorescent meaning it glows all the time, and the tubes have enough gas to glow for 25 years. This is far more useful then luminous paint because it glows brightly and constantly without the need to charge from ambient light. At $1,800, the Black Seal is a serious sale uggs with a serious look and a very comprehensive set of features.The Sinn UXWe 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.