Just like in the movies, but it's a US sub that gets the new silent drive.
Sounds like whales humping.
www.navalnews.com
Sounds like whales humping.

U.S. Navy Submarine First In World Fitted With Silent Caterpillar Drive - Naval News
Submarines use stealth to dominate the seas, presenting an illusive yet deadly threat. Now U.S. Navy submarines will take stealth to a new level. American submarines will now be fitted with magnetohydrodynamic drive.
