The reason why submarines are always underwater is that they have a component called ballast tank which allows the water to enter making the submarine be in its position underwater as the weight of the submarine is greater than the buoyant force. Make education fun! Book text converted into Animated content. Download the App: https://play.google.com/store/apps/details?id=com.homerevise.studyapp #HomeRevise #study #learn #academic #academics #student #teach #teaching #teachers #educators #learnin