This is a timely thread as I am starting to think about my trip on the Odyssey. Are the al30's already rigged or do I need to bring my own rigging?
Are the wrecks wide open these days because of decay or is it best to use a reel in general?
I would like to do some of the deeper wrecks before getting on the boat, I like helium. it sounds like the Truk Stop may be more convenient for this?
Having now done Truk from land (Blue Lagoon) as well the Odyssey (2009) and the Truk Siren (two weeks ago) I can tell you that the Truk Siren is my new favorite way to dive Truk.
Siren can accommodate rec, tec, TMx, and rebreathers. Seven-day and ten-day itineraries, offering four dives per day. As a new boat (to Truk, that is) the dive/tec gear is all new/newish. Deco and stage bottle are all done-up with DiveRite sling kits to the satisfaction of my DIR-sensibilities.
The diving in Truk is well known, and will be the same wherever you dive from. No need for me to go into details there.
The Truk Siren is spacious and comfortable. (Odyssey is fairly spacious too, perhaps a bit less comfortable.) The food is great. (As it was on the Odyssey as well.) Cabins on the Siren are the largest of any liveaboard I've ever been on, bar none.
The Odyssey is great, don't get me wrong. I'd dive with them again in a minute. But if I had the choice, I'd go with the Truk Siren.
The Siren has a different feel. More like you're on someone's private yacht than on a liveaboard. The Panisi-style sailing design of the Siren is just a touch longer than the Odyssey but nearly 10 FEET broader in the beam; Siren = 33 feet, Odyssey = 24ft. That extra 9ft is obvious in the salon, dive deck, dining deck, and most of all in the cabins and ensuite heads. I've long said that the Odyssey ruined me for any other liveaboard. The Truk Siren has raised the bar that much higher.
The crew was phenomenal... as was the crew on the Odyssey when I dove with them. I'm willing to assume they still are. The Siren has just brought on board an Operations Manager who captained the Truk Aggressor for many years so his knowledge of Chuuk, the Lagoon, and the wrecks is great. Tom - Cruise Director and Dive Guide - has lots of experience on Siren boats and is a well-trained tec diver/instructor. Local guides and dive assistants are great as well. Crew totals 12 people, from a dedicated captain (he drives the boat, that's it) to two chefs, a hostess, dive assistants, deck hands, and even a masseuse.
At first I thought I'd feel that 4 dives per day on the Siren (vs five on the Odyssey) would be giving something up. But as deep and as long as some of these dives are you'd really be pushing it to do five dives a day.
I also think the 10-day itinerary is ideal. More days obviously lets them get to more wrecks but it also afford them the ability to offer three dives on some of the larger, more interesting wrecks. No need to feel like you've got to zip through everything to see it all.
Logistically, the Siren moors/leaves from Truk Stop and the Odyssey moors/leaves from Blue Lagoon. Not that it makes a huge difference after 37hrs of travel to get to Truk, but worth keeping in mind as you plan travel. in fact the Siren dispatched a skiff to pick up one of our passengers from Blue Lagoon.
I should probably write up a full review at some point, but the summary is "Highly Recommended - Five Stars."
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