after 5 minutes all indicator lights were flashing?

Yep, they don't like water, I would start by placing your hand on the carpets in both the front and rear drivers and passengers side to check for water. If so this will need to be dried out and the moisture has affected the computer systems inside the car. IT find the root of the issue and the module that needs to be dried out which can fix it you will need to use a CAN scanner, this guide can show you how.

https://youtu.be/u-4syLc-ifQ

There are many modules under the seats and carpet. Here are a few which are tied into the CAN BUS system. Check out the images (below). Please upload pictures or videos in your response.

I had someone scan my Santa Fe Sport. The Blind spot monitoring on both left and right work. It lights up and sounds off. The turn signals left and right both work (front and back). Air bag indicator turns off when someone sits in the front passenger seat.

When they did the CAN scan what codes did it have?

ODB2 scan showed no codes. The CAN scan showed: Present B250000, B149300, B1285, B2409, B251800, B252200

Yep, these are all airbag and HVAC codes, I would disconnect the battery and remove the front seats and side molding to help lift he carpet to help the car dry out. Next, I would make sure the modules under the carpet are dry. I would disconnect them and make sure the electrical connector are not corroded. Please upload a short video of the results so I can see.