Water below my passenger seat

Hi everyone,

I have a 2013 Toyota Corolla. A few days ago I noticed some sound when I was taking a left turn and sometimes when I was applying brakes. The sound resembled the sound you hear when you are handling plastic bags. I looked around the passenger seat and saw some water seepage as well. This is how it looks like.
https://drive.google.com/file/d/1FVH-XZL6ROt31ty8H025c5psaO5xuP72/view?usp=sharing

Please let me know if anybody has an idea what this problem might be.

Regards

Have you been using your A/C? If so, evaporator condensate drain may be plugged and condensate is drooling out the HVAC box seam onto your floorboard in behind the carpet. Especially since you see water on the passenger side ....