Just got back from Cocos on Sea Hunter and I can affirm what matt215 said above. It was el nino conditions and the water was warm. Around 82F. The guides said that the hammer action was down due to el nino. We saw a good number of scalloped hammers, white tips, black tips, a couple silver tips, 5-10 tigers and a whale shark at Dos Amigos (Small). Diving from the rigid pangas makes a big difference for an old guy like me. Definitely easier that a zodiac. The water was kind of murky and good photos were tough unless they came right to you, which did happen. Diving is deep, generally starting at 100-110 feet, definitely on nitrox 32. Three dives a day. Watch your nitrogen loading. We had a couple folks end up on oxygen due to symptoms of skin bends. They were diving within the NDL limits of their computers, but got mild hits anyway. No long term effects.
It's 36 hours each way from the mainland. Fortunately we had mild conditions both ways. Not always the case.
Crew is excellent and boat is very comfortable. They are running the Sea Hunter and Argo to Cocos. I don't believe that they are using the Undersea Hunter for that itinerary any longer. Combination of older vessel and lower demand for the trip.
If you're planning on 2015, you need to get moving. These trips book up early. At least the Undersea Group does.
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