Can you get a tan swimming indoors?

Question

Sounds odd, I know but hear me out. I swim in a pool on an enclosed rooftop. The roof of the pool area is ALL windows and the sun beats down into the aquatics area. The pool is enveloped in sun. Will swimming there allow for a suntan while swimming?

Answer 1

Very slight possibility. But most ordinary glass doesn't block the sun's UV rays, so it is possible. Perhaps the glas enclosing the pool area is treated somehow, though, so very little tanning UV light can get through.

Answer 2

It is possible, but not likely. It would probably take a long time.