If the worst happens and your bike goes under, ideally kill the motor before it goes in. If water gets into the engine, it’s a pretty long procedure to de-drown it fully on a modern adventure bike, but basically it goes: Empty/dry airbox, remove spark plugs, and empty water from cylinders, then drain oil and replace with fresh and a new filter. Then repeat oil changes until the oil no longer emulsifies. In other words, don’t get water in there in the first place. Most importantly, walk the crossing first, ride at a steady pace, and, if you’re in any doubt, either walk it through or find another route. Once you know the crossing is good, then is the time to pull the camera out and get some nice dramatic watersplash shots.