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 ...

We rely daily on the GPS on our phones to get to many different places in our lives. However, the technology stops working in the depths of the ocean, which is why submarines need something different.

Inside a diesel engine's cylinder, compressed air raises the temperature to ignite injected fuel, and the resulting force drives pistons to power the vehicle's main gears. Chief to this combustion ...