Caicos Tours offers semi-submarine tours of the reefs off Providenciales. Their Turtle Reef Adventure takes you out to the reefs where you'll see a wide range of fish, and each person has their personal viewing window. The Mermaid Adventure incorporates the above, and you'll also get to see a real live mermaid swimming around the boat. It's a unique way to see the aquatic life of Providenciales.
The 'Undersea Explorer' semi-submarine operated by Caicos Tours.