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2. Marathon Watch - Wikipedia

   en.wikipedia.org/wiki/Marathon_Watch

   Desert Storm Wristwatch (1990) prototype. Final version supplied under the Marathon label. Marathon Watch Company Ltd. is a Canadian watch manufacturer founded in 1939. Its predecessor company, Weinstrum Watch, later to be named Wein Brothers, was founded in 1904. Marathon started supplying watches to the Allies of World War II in 1941.

3. Diving watch - Wikipedia

   en.wikipedia.org/wiki/Diving_watch

   A diving watch, also commonly referred to as a diver's or dive watch, is a watch designed for underwater diving that features, as a minimum, a water resistance greater than 1.1 MPa (11 atm), the equivalent of 100 m (330 ft). The typical diver's watch will have a water resistance of around 200 to 300 m (660 to 980 ft), though modern technology ...

4. Squale Watches - Wikipedia

   en.wikipedia.org/wiki/Squale_Watches

   Jacques Mayol broke the world record for breath-hold deep diving on numerous occasions while wearing Squale watches. [5] Tony Salvatori, 1967 French champion spearfisher [citation needed] Jean Tapu, world champion diver, 1967 [9] Maria "Jolly" Treleani, world record breaking deep diver (triple world champion of apnea, 1965, 1966 and 1967) [9]

5. Water Resistant mark - Wikipedia

   en.wikipedia.org/wiki/Water_Resistant_mark

   The test for qualifying a diving watch to bear the word "diver's" on the dial is for repeated usage in a given depth and includes safety margins to take factors into account like aging of the seals, the properties of water and seawater, rapidly changing water pressure and temperature, as well as dynamic mechanical stresses encountered by a ...

6. Zodiac Watches - Wikipedia

   en.wikipedia.org/wiki/Zodiac_Watches

   Zodiac Watches, or simply Zodiac, is an American [1] brand of Swiss-made watches founded in 1882 by Ariste Calame in Le Locle, Switzerland. The company mostly focuses on its dive watches through its Sea Wolf line, [ 2 ] one of the first modern dive watches, which debuted in 1953, before the Rolex Submariner and after Blancpain Fifty Fathoms. [ 3 ]

7. Helium release valve - Wikipedia

   en.wikipedia.org/wiki/Helium_release_valve

   When saturation divers operate at great depths, they live under pressure in a saturation habitat with an atmosphere containing helium or hydrogen.Since helium atoms are the smallest natural gas particles—the atomic radius of a helium atom is 0.49 angstrom and that of a water molecule is about 2.75 angstrom—, they are able to diffuse over about five days into the watch, past the seals which ...