The floor pan has lots and lots of depressions to create strength in the floor pan,
any liquid split would initially go into the carpet & heavy foam backing when that became saturated the fluid would go into the depressions in the floor pan. The resultant Coke will simply go to a sticky mess as the water evaporates.
Edit here is an image of a T5 rear side of the carpet to help you understand the profile, the raised parts would fit the depressions in the floor (T5 &T6 very similar)
edit you can see two access flaps under where the seats would be, In This area of the floor there is a large depression where lots of wires pass through.
sorry to hear your woes, I hope that helps imagine where the coke has gone
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here is a perfect picture courtesy of
@Loz showing the battery and electrics directly under the passenger seat (RHD)
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