I went there in July this year. We dove with Iyanola Dive Ventures through the Carnival excursions.
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They were nice guys. We dove the pitons. 1st dive was to about 60ft max, drift dive called Superman flight. You can look it up by that name online.
The second dive was just a couple minutes away by boat. It was also a low current drift dive.
The boat was super tiny. There were 11 divers on the boat and the Captain and DM. Maybe 2 more people could fit. There was only enough room for 1 tank each along the sides of the boat. The extra tanks for the second dive were stacked up behind the steering wheel.
I didn't take a lot of pictures because I am inexperienced, but here you can see some from St. Lucia.
I also dove St. Maarten and St. Thomas.
If you have time to go again I would recommend both but probalby St. Marteen more.
The guys at St. Thomas were cool and the boat and dives were nice but they limited us to 38min per dive because they had to keep the cruise ship schedule.
St Lucia didn't limit the dive. We got back to the boat later than planned. We were back around 2. But that is because some ladies were seasick and the captain dropped them off at a beach club so we had to go pick them up.
St. Lucia Dive - a set on Flickr
St. Marteen dive locations are within site of the cruise ship and pretty cool. We dove 2 wrecks there.
St. Maarten Diving - a set on Flickr