We recently had flash flooded roads here in the Philly area. I was driving through some serious (inch or two) but not life threatening areas of roads where the water was moving quickly. This resulted in a lot of splashes up against the underside of my car, I'm sure (probably worse than going through a car wash with the "undercarriage" feature). Since then, noticed a musty smell. Thought it was water that had gotten into the cabin AC system. Nope -- eventually realized that the lower "under floor" storage area in the truck must have taken on a lot of water, as a blanket there was soaked, and the carpet / trunk liner was damp. Time to investigate. Many strange surprises ahead. Removing the carpet / trunk liner revealed a sound insulating mat. It was soaked (this is days later). I could not fully remove that because the amazing design includes a round hole in the corner through which passes a wiring harness. However, I could lift it 99% out of the way to see the trunk bottom. Does anyone know if there is an easy and safe way to remove this sound insulating mat? Meaning a nearby harness connecter that can be disconnected without danger of shock? Under the mat, the floor of the trunk had residue of mud confirming my suspicions that this was not collected rainwater; it was ground water that had intruded upwards. Next up, the surprises I found under the mat: What appears to be a screw piercing upwards through the floor! Definite possibility for water incursion. Anyone ever see anything like this? Strange metallic foil "patches" in various places, and one huge one that covers most of the trunk bed. Is this normal? The big gasket around the wiring harness is supposed to seal the hole where the harness passes through the trunk floor. However, in my car, the gasket was not properly in place. There is a thin groove in the gasket that the metal of the floor is supposed to mate with to make a tight seal and also prevent the gasket from being pushed upward by water pressure. But the gasket had not been pushed down forcefully enough and the floor metal was not inside the groove. No, as for any abnormalities (screw piercing the floor, gasket not installed properly), this may or may not have been this way from the factory. This is a 2014 manufactured P85D and for that model car, it was an option to install a 2nd charger. The car was an Inventory unit, so I did not get to configure it. So I purchased the 2nd charger option and it was installed by the local Tesla service facility when it arrived (none in stock). So in theory, any strange things in the truck might have happened during that service. The screw thing seems really unlikely, though. Love to hear from anyone who has information about this stuff or similar experiences. I've searched the Internet and these forums and there's surprisingly little information about what's under the insulating mat in a Model S (or how to remove it if that's even possible without cutting through the corner to the hole). And for those curious and not paying attention to the mud residue, yes, I'm familiar with the panoramic roof leak (mine serviced once but still does it; 2nd service for that scheduled), and with the hatchback leak where it fills with water and pours out when you open it (already serviced and seems fixed).