A passageway created by boring through mountains, seabeds, or underground, allowing travel or transport from one side to another. This term can also describe a prolonged state of stagnation in progress, as in emerging from a long tunnel of difficulties.
In baseball, the act of a fielder allowing a ground ball to pass between their legs, resulting in the ball going into the outfield.
A company that exists primarily to facilitate transactions between other parties, serving as a guise to channel profits or resources without engaging in substantial operations itself.
An entity formed for the purpose of obtaining profit through intermediary actions, often repurposing assets from public or large enterprises, commonly characterized as a front organization with minimal legitimate business activities.
A nominal company created mainly to secure financing or manage profits in a way that obscures the true nature of its financial activities, often employed in business dealings to minimize accountability or risk.
A structure that is constructed beneath the sea to connect land masses separated by water.
An engineered passageway that runs through the ocean floor, facilitating transportation between areas that are otherwise divided by marine environments.
A subterranean tunnel located under the ocean, designed for various types of travel such as vehicles, trains, or pedestrians, ensuring direct access between coastal regions.
An underground route that provides a means of traversing bodies of water, providing an alternative to bridges or ferries between adjacent shores.
An imaginary tunnel that allows a traveler to pass through and experience different periods in time, such as the future or the past.
A conceptual passageway that connects two distinct points in time, enabling movement between them.
A fantastical route that serves as a gateway to various temporal dimensions, facilitating time travel.