Spotter planes can no longer directly see enemy submarines. Today, their mission is overwhelmingly acoustic—listening to signals from submarines and narrowing down their likely position before taking ...

California residents spotted another ominous plane, the Navy’s “submarine hunter,” zooming over Fresno Tuesday night. The intelligence aircraft made its flight days after the “Doomsday” plane, the ...

Submarines are hard to find. They exploit ocean depth, acoustic complexity, and thermal layers to maintain low observability and high survivability. Diesel-electric submarines are especially quiet at ...