64 lengths

Oh! also, I just swam 64 lengths.
Apparently that is a mile.
It was outside and I was wondering something...
When you swim underwater, and look directly upward, you can see through the surface of the water, but from an angle, you see the reflection of the bottom of the pool, so it looks kind of silvery.
I wonder at what angle the effect changes, and if I can somehow make a picture from both effects at the same time, or something...

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