Kilo Class Submarine

The Kilo-class submarine is like the ninja of the seas—stealthy, deadly, and almost impossible to detect. Built by the Russians, these diesel-electric attack submarines have been around since the 1980s, and despite their age, they’re still making waves (literally). NATO gave them the name “Kilo-class,” but the Russians call them Project 877 Paltus, and the upgraded versions go by Project 636 Varshavyanka—because apparently, long, complicated names make things sound cooler.