Yes it waterproof for down to 10m. for it is not for diveing it is for climbing

30M is the nominal rating Suunto gives the Core. The depth gauge on the watch goes to 15m, however, so shallow dives will be about the limit for the Core. More than that, and you should look at the Suunto D series Dive Computers. If you're concerned about the all around water resistance, it'll shrug off just about anything short of deepwater dives.