Transparent boat

Come aboard a glass-bottom boat in Cozumel, Mexico, and cruise over the turquoise waters of the Caribbean Sea! This is the only 100% transparent boat in the world that lets you see the spectacular fish, coral, and sights under the sea just north of the famous El Cielo.

https://cozumeltourbase.com/tours/cozumel/water_boat/cozumel-glass-bottom-boat-and-snorkel