Great Barrier Reef 1988

I came across this pic today when I was rummaging around in an old photo album of mine.
I took this pic way back in 1988 on a snorkelling trip to the Great Barrier Reef. I hired an underwater camera and I can't remember what type it was but it was massive and was in a huge transparent box about 15cm square. Most of the photos were so-so, but this one turned out rather well.