I have seen comments that the semi-submersible excursions are not very pleasant. Supposedly, the boat smells strongly of pine cleaner over vomit and quite a few passengers get sea sick every time. Is this always true? Are some areas worse than others (e.g. Eastern Carib. vs. Western Carib.)? Do we want to consider a semi-submersible to see the coral?
We did a semi-sub. in Aruba a few years back and had no problems. We took a boat out to where the semi-sub. was moored, climbed aboard and went down some steps to a large open area with glass all around and benches running the length in the center. Just like a picture window under water. It was really pretty neat. Any problems may be related more to claustrophobia.
That is reassuring. There was no smell? We would really like to do this if we can do it without getting sick from either the motion or the smell. (Am I the only one who vomits if I smell vomit? Motherhood had its moments!)
I did this Sea and See Island tour in Aruba last year, and the Seaworld Explorer semi-submersible was the best part of the excursion for me. It did not smell at all, and I did not have any problems with feeling motion. I don't think you'll be in the ship that long to feel so much motion anyway. You take the stairs and you're about 5 feet underwater, but the ship does not submerge. You can see the surface at all times. The tour shows you Antilla, a ship that was destroyed in WWW 2, and you can see fish and coral formations throughout the ship. It was eally amazing. I'm sure you will enjoy it.