Question: Can a tunnel be underwater?

Today, underwater tunnels are often created with humongous tunnel-boring machines (TBMs) — sometimes called moles. Another new method of creating underwater tunnels is the cut-and-cover method. To use this method, builders dig a trench in the riverbed or ocean floor.

How deep is a tunnel underwater?

The tunnel is 7,765 metres (25,476 ft) long and reaches a depth of 287 metres (942 ft) below sea level, and was the deepest undersea tunnel in the world until Norways Rogaland county opened its 292 m (958 ft) deep Ryfast tunnel system in December 2019.

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