Apparently the Turkmenistan mechanic (I mixed up my Stan country) tore the vehicle down and noticed very little water damage. Check out the npr story
The salvage car Silk Road
Newer vehicles have more and more electronics which is an issue if submerged in water. Again Turkmenistan is ran by a wacky dictator who sets bizarre rules making it difficult for people to get decent vehicles. Second true it's difficult to get a complete scope of the damage as the hurricane in New York was mostly fresh but likely had a decent amount of salt water. One of the Car Trek series, Ed Bolian picked up a "Flood Lamborghini Gallardo" apparently there was very little carpet staining showing that most of the damage was to the exhaust and underside. Not all "flood" vehicles are completely submerged.