Looks like the rain fall easily reached the bottom of the floor boards & door frames. There are drainage plugs on the undercarriage, which are usually plugged by rubber caps, so that normally water doesn't intrude but they can be removed to let water evacuate. Looks like you very well may have to steam clean the carpets at the very least. I would also check out electrical diagrams to see where, if any (there are usually a few) harnesses run through under the carpet.
Good luck with everything & I hope there's not too much damage.