Ships, Boats & the Deep
How a Submarine Dives
A sub doesn't have an elevator. It changes its OWN weight — letting water in to sink, blowing it out to rise.
A submarine slips under the waves and just... hangs there in the deep blue. No cable. No elevator. So how does it pick a depth and stay?
Concepts you just met
Ballast TanksNeutral BuoyancyCompressed AirDensity Control