Water affected 2008 subaru impreza wont start

Hi all,
Due to the flooding here in mackay, alot of things got wet.
But it has got me wondering, why wont our brand new car start when it has been left turned off and sitting in rising flood water at home in a carport.

Only came to 5mm above the bottom door seal on the passenger side (water level water lucky to reach the middle of the wheel).

It is a 2008 subaru impreza, with wet carpet, dry engine bay, flickering electrics, no starting noises except for clicking noises. I jacked up one side to drain a little water out of the muffler.

We rang RACQ yesterday to come and at least have a look (no cost since we are members) and they said they are 4hrs away. They rang back 1 hr later to say they wont come and look at it and it is automatically an insurance job(which will cost us an excess of $350).
Even if it is insurance, they could at least look at it and diagnose for free (membership), but they wont because it is mackay.

We could maybe let is dry more, maybe charge the battery? and wait for the wet weather to completely go away and try again later,it may come good.

It may be something simple but i am no mechanic, so if anyone may know a cause or a simple fix that is worth a try, has had something similar happen before and found a fix, please reply.

Thanks for your constructive comments.