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The world's deepest tunnel you can drive through was set to be completed in 2025, but it looks like plans have changed.

The floating underwater tunnel would consist of two 4,000-foot-long, curved concrete tubes, submerged 66 feet below the surface of the Norwegian Sea.

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“Instead, engineers might consider a floating submerged tunnel, anchored to the seabed with cables, or a hybrid of an underground tunnel and an above-seabed structure.” Don't miss ...

Image: JinkoSolar. One arm of the floating PV segment that is currently attracting great interest in the industry worldwide is the concept of locating floating solar systems offshore, in the open sea.

The project envisions a floating tunnel submerged at a depth of 160 feet using cables anchored to the ocean floor or a hybrid model has been proposed.

Flooding that submerged about 400 feet of roadway in the tunnel Wednesday night was the result of a clogged drain that took about four hours to clear, a state official said.

One alternative gaining attention is a floating tunnel submerged 49 meters underwater, composed of prefabricated segments tethered by cables.