I set my flashes up to photo yesterdays group crossing the water, but they were so fast, and I was so slow, they'd just crossed and jumped out the boat before I pressed the shutter! Not to worry, looks nice as it is.
Despite the reflection of the roof, that water is 90 feet deep straight down.
(Photo of Rhiw-bach Slate Quarry uploaded by Penitent Miner. Please do not copy without permission).