What describes a tunnel hull?

A tunnel hull is characterized by its unique design that includes an air pocket or tunnel running along the bottom of the boat. This feature allows the hull to trap air as the boat moves through the water, which helps to reduce drag and increases lift. As a result, a tunnel hull can achieve higher speeds and better performance when planning on the water. This design is particularly beneficial for certain types of boats, such as performance racing boats and specialized fishing vessels, as it enhances their maneuverability and efficiency.

The other options describe different hull types or characteristics. For instance, a flat bottom hull offers stability but does not have the lift capabilities of a tunnel hull. A hull designed for cruising in shallow waters typically has a different shape and construction, and boats meant for slow speeds on calm waters would have other design features that prioritize stability and comfort rather than the performance benefits provided by a tunnel hull.