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I'm not big on cold water diving, but this looks like an AWESOME dive!
The water temps range from 2-4C (36-39F) and there are strong currents. There are also, on any given day, up to 300 small earthquakes in the national park where the ravine is located. Still, this looks like an amazing place to take the plunge.
Its ok to dive this as the cold water bit gets cancelled out because its in a far off destination and its crystal clear. Counts on all waters from -2 to 10 degrees as long as its not where you live.