MITCHELL — For all the time he’s spent in the water, Brock Russell has never been in the ocean salt water. In fact, he’s never even seen the ocean. That’s about to change for the 16-year-old Mitchell native, though, as he prepares to head out to Irvine, California, for the Junior Nationals Championships on July 31 through Aug. 4. But that’s only after he swims at the state championships in Aberdeen on July 22 and 23 and the USA Futures Championships in Fargo, North Dakota, on July 26-30.