On our school we have something called a science fair once a year. To participate (which we have to) we need to make a science project. Our is about why you need to equalize while diving. So we had to dive. Laila and me didn't know how to dive, so we took a Discover Scuba Diving.
The first day the diving instructor told us what to do in the pool. We learned what the signs meant, how to breath, how to get water out of your regulater and other stuff.
The next day we went in a boat out in the ocean! Under water we brought an empty bottle and we filmed what happened to it, which you can see in the movie.
Here are some pictures:
Since you can't see our project, this is the video we made:
What happens with the bottle is what happens with your airspaces ( like lungs and ears) if you do not equalize while diving.
When we went down, there was more pressure, so the bottle shrank, and when we went up, it was less, so the bottle expand.
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