When we think about being on the water, usually we want things to float, like boats and ships sailing. But, what if we want something to drop below?

In this Hub Lab Phil of Science talks to us about submarines and how they can control how and when they dive below the waves.

With some simple things you can make your own mini sub. BUT, be careful not to splash water around the place or you might have a bit of cleaning up to do!

Did you know that the person who invented the first submarine for the US Navy was Irish?! 
Learn a bit more about John P Holland here: RTÉ Century Ireland

Learning Objectives - WALT (We are learning to…)
1. We are learning why some things float and why some things sink.
2. Their materials and their properties
3. How we can control buoyancy and use it to our advantage.


We are going to learn why things float and sink in water, and how we can control it to use to our advantage. Understanding how density, floating, and sinking work has allowed us to build many amazing things!

Submarines, scuba divers, ships all use this knowledge to control how they move in the water. Air is less dense than water, so if an object has more air in it, it will float more. We will see this using a bottle in the experiment and learn how this is applied to submarines.

You can download the full lesson with much more information below...

Catch up on ALL of Phil's experiments so far here: ALL the Hub Labs in one place!