Marathon MSAR Quartz Mode D'emploi page 9

WATER RESISTANCE
The MSAR Quartz is made from 316L surgical-grade stainless-steel with a
®
screw-down crown and a synthetic sapphire crystal that allow it to operate
while submerged down to 300 meters or 1000 feet underwater.
30 ATM – 300 M (1000 FT)