German U boat warfare in WWII. The Germans almost defeated the Allies early in the war with their sub force. They nearly destroyed enough shipments of arms and food from the West to England to stop the war and force the British to surrender altogether. "Run silent, run deep" was a command given to sub crews when in enemy territory. Running deep and with the minimal amount of noise meant a less noticeable sonar blip on any enemy ships nearby.
German U boat warfare in WWII. The Germans almost defeated the Allies early in the war with their sub force. They nearly destroyed enough shipments of arms and food from the West to England to stop the war and force the British to surrender altogether. "Run silent, run deep" was a command given to sub crews when in enemy territory. Running deep and with the minimal amount of noise meant a less noticeable sonar blip on any enemy ships nearby.