50m ne znaci da moze 50 metara pod vodu:
he ISO testing procedures are rigorous, but it doesn't involve someone diving 50 meters below the surface and then checking the time. Instead, it's a pressure test in a laboratory that's comparable to static water pressure, coupled with immersing in 10 centimeters of water for one hour. The official measurement is atmosphere (ATM), which is equal to 10 meters of static water pressure.