Rose is very steep as you can see from this 3D projection made using the NOAA bathymetric data. The top blue line runs from -2 to -500 feet deep! So you can see we only dive the very tip of the volcano. 

Here is the satellite overview of the atoll. It is oldly square-shaped and has a central lagoon which is over a hundred feet deep in places! 

Even close-up, Sand island is really not much to see. I was rather jealous that the governor got to go wander around on Sand island today, but then I remembered that I got to dive...



That's an octopus for those of you not used to seeing them in the wild.
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