How Do Submarines Dive and Surface?

SciShow Kids

In this engaging episode of SciShow Kids, host Jessi and her robot friend Squeaks explore the science behind how submarines function. Starting with a viewer question, the video breaks down complex physics concepts like density and buoyancy into age-appropriate explanations, using clear analogies and demonstrations to show how an object can change from floating to sinking and back again. The video covers key scientific themes including density (described as how heavy something is for its size), the mechanics of ballast tanks, and the requirements for human survival underwater, such as air supply. It also touches upon marine biology by illustrating the types of sea creatures scientists might observe while exploring the ocean depths. For educators, this resource provides a perfect bridge between physical science and engineering. It offers replicable classroom experiments—like the jar demonstration—that make abstract concepts concrete. The video encourages inquiry-based learning and helps students understand that scientific principles can be applied to build machines that explore the world around us.