One of the big questions that inventors faced in the development of professional diving was the following: "How do we get fresh air down to the diver?. Before any type of pump was used, the diving time and depth were very limited. For example, the Greek sponge divers could only stay down for as long as they could hold their breath. The first diving bells took down barrels on the side that contained fresh air. John Lethbridge went down in his diving engine that was in fact no more than a large barrel. He had to come up to the surface regularly to have the lid removed and let fresh air in.
The invention and use of diving pumps opended the way to greather depths and longer diving times. You came to the right place to learn all about them.
Make sure to visit our modern air supply section