Armed with liquid metal reactors and titanium hulls, these submarines weren’t just advanced—they were terrifying. Built in secrecy and pushed to extremes, they changed naval warfare forever.

Deep above the clouds flies the most secretive and vital fleet in America’s arsenal – the Doomsday planes. From the Cold ...

According to mission co-lead Scott Glenn, the experiment marks a “historic moment for ocean science. We’re deploying a robot ...