My next door neighbor had an old Chevy pickup rigged for crossing a small channel of the Mississippi River onto Rodney Island where his hunting club was. He drove through water up to his waist sometimes. He had to loosen the fan belt to keep the fan from churning the water. I couldn't figure out how the electrical system didn't short out.
Then again, I was with my brother in law when he drove into water up to the headlights on his Toyota pickup - one of the old ones that had a big "TOYOTA" on the tailgate. It did not have a snorkel or anything else special. He was going downhill though, and backed up when the headlights went under.