Have you ever seen a movie where people dive really deep into the ocean while wearing big, strong suits? Those suits are called atmospheric diving suits, and they help people dive deep under the water and explore the ocean without getting crushed by the pressure.
A long time ago, people didn't have these special suits. They had to hold their breath and swim down as far as they could go, but they could only stay there for a short time. As time went on, people started inventing diving bells, which were like big metal boxes that could go down into the water, but they couldn't move around very much.
Then, in the 1800s, people started making diving suits that looked kind of like big metal pants and jackets. These suits had air pumped into them so that the person inside could breathe normally and stay down in the water longer. These suits were heavy and hard to move in, but they were a big step forward.
As technology got better, people started making better atmospheric diving suits. These suits got lighter and stronger, and they had new features like video cameras and robotic arms that could help the person inside do more things while they were underwater.
Nowadays, there are many different types of atmospheric diving suits, and they are used for all sorts of things. People use them to explore the ocean, study sea life, and even do things like repair oil rigs that are deep under the water.
So the timeline of atmospheric diving suits starts a long time ago with people swimming and using diving bells, and it continues to get better and better as people invent new things and improve technology. Pretty cool, huh?