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I wanted to share this Hero4 video I just completed (Sony Vegas for editing). I used a pair of Heros, so we could get different angles.
I focus on coral and most of the best colour is in the 5 - 15 m range. I go deeper for turtles and rays, but our long ray sequence was at about 5 m directly beneath the mooring at Gordon's Reef.
Viz in outer Dahab (Gabr) was 35 m. In Tiran, 25 m, but a much greater variety of big life.