Yes, Siberians are not afraid of water and love to swim - provided they are properly introduced to water early in life. Here some of my own are demonstrating how well they do that in the family pool and a river. But, most often, you will see them walking around the rim of the bathtub when you are bathing in it or even joining you in the shower :)

CornucoPia Cappuccino (aka, Cubby, in ON) loves to swim in the family pool with his human brother

Wicked girl Wicket decided to cross the stream on her own accord to the great surprise of the family (a safety west is clearly unnecessary) :)