Here we have a Seat Leon with wet carpets, and although there is evidence of leaking through the door membranes, this doesn't tally up with the large amounts of water in the boot.
Upon further inspection, the culprit is the rear air vents, which we will address. Sometimes if the air vents are leaking from around the seal, they can just be resealed, however these vents act as a kind of one-way-valve which can wear out over time, in which case it's best to replace them. They can also get clogged with dirt which sprays up from the road.
We would recommend the carpets be lifted, and the car properly dried overnight.
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