On the shores of the Baltic Sea, in the south of Denmark, a vast engineering marvel is taking shape — piece by giant concrete piece — that, when finished, will drastically redraw the road and ...

Linking Denmark and Germany, the Fehmarnbelt will carry two-lane road highways under the water in both directions, plus two electrified rail lines — a multiple tube thoroughfare that will plunge ...

California's 848-square-mile marine reserve, the largest network of undersea sanctuaries in the continental United States, is now complete. The marine reserve stretching from the Oregon state line ...

LONDON—For around a decade, the Russian spy ship Yantar has crossed the globe and loitered over undersea cables in what Western officials suspect is an attempt by the Kremlin to map vital ...