Wow. Thanks Mechawombat for those pics. I knew it was a heap wider, but those shots really give the width of water above some real perspective.
There's only one "hole" in each pylon now visible, where there used to be two. The ledges we used to climb up on to have a rest are much deeper down than I thought. I'd mistaken them for being just under the water in my pics, but forgot there were two holes, and looking at your pics, those ledges are a probably 10 to 12 feet under. Wow!