Brought my son on the trip and this is a fantastic experience. You take a fast ride on their catamaran and get to see the Sub rise out of the depths. Get to see great views of the reef and Carthaginian at 80-120 feet depth. I scuba dive, and it's fantastic to be able to bring family that can't dive with you down to the reef.
10x better than doing the glass bottom ""submarine"" ride near the harbor. It's very worth the money, and I recommend it even over a helicopter ride. It's quite a value, particularly as you can pick up discount tickets at discounters on the street or in a condo.
Only downside is one child was 35"" and we had to get a refund as they weren't able to go on the sub. They have a 36"" restriction as a result of coast guard rules for the life vests.
Pros: How often get to be on a submerged submarine!
Cons: 36"" Height Restriction
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