This Top Gearski scene proves we still live in a magical, mythical world where everything is possible. Did they use their magic to grow gills or is this a special car that works underwater like the Flying Ford Anglia from Harry Potter? There really isn't a good explanation for how the engine on this Toyota Land Cruiser still works while completely submerged. OK, it's got a snorkel, but what happens to the spinning blades of the radiator fan while underwater? And how is the stereo system still working even though the car is cabin is completely flooded?
And forget about the "how?" questions and answer the "why?" ones. For instance, why would the men ever continue to drive though the lake if they're neck-deep in water? And why do they take pleasure from turning a Toyota into their fishing boat?
In civilized countries, most roads are paved, but in Russia, they just seem to improvise and use lakes. We can only presume they have experience in the army, where this sort of fording is natural. But we still reckon that in a couple of weeks, all the fish will have died from the oil in the water and the shock of seeing tire tracks on the bottom of their lake.