Is it normal to see scalp when hair is drenched in water?

This can be normal in some cases. Hair loss needs an in-person evaluation. I suggest seeing a hair loss expert now to evaluate and go over your condition and provide you information about your best treatment options. There are great non-invasive options like prp/progesterone and/or hair transplantation. See an expert. Best, Dr. Emer

It depends on the person and hairstyle. People with naturally thick, dense hair who have longer hair probably wouldn't see their scalp unless they were actively thinning/balding. Conversely, someone with naturally thin hair who has a shorter hairstyle may be able to see their scalp even when the hair is dry, yet not have any significant thinning. If you are worried your best bet is to check with a specialist.

İt depend on quality of your hair..ıf you have a thin hair, yes . ıf you have a coarse , wavy , thick structured hair shaft , no . 

If your hair is fine, then it is easy to see through the scalp when it is wet more than if it were coase. Best way to find out if you are balding is to get a HAIRCHECK instrument test