To be precise, the Galaxy S5 is certified to resist water when submerged at depths of up to one meter for no longer than 30 minutes. via Link
The new Samsung Galaxy S5 has an IP67 rating, well according to Wiki – It simply means Protected against water immersion – Immersion for 30 minutes at a depth of 1 meter.
However, in this video, the guy sends the Samsung Galaxy S5 1meter to the bottom of the pool for an hour. He also sends the phone tumbling another hour in the washing machine. The phone comes out fine. I’m very impressed. You can now even bring your phone with your to the shower.
Skip the video from 1:37 to 4:54, you won’t miss anything