The Havana Tunnel under the Ocean

 The only major structure in Cuba that passes under the ocean (under Havana Bay, which opens to the ocean) is the Tunnel of Havana in Havana.

Charging a camera in Cuba is very difficult and time-consuming; my camera's battery ran out on the road, so I took this photo with a Fuji Camera, which is why it's a bit grainy.

The Havana Tunnel under the Ocean

Key features of the Havana Tunnel are: Location: Located in Havana, the capital of Cuba, at the entrance to Havana Bay. Length: 733 meters long. Depth: Passes approximately 12-14 meters below the ocean floor. Passage: Serves as a road tunnel and connects the two main sides of the city.