I love diving or ambient pressure diving, you become directly exposed to the pressure of the surrounding water, it is thrilling!
I've never done that but I have always wanted to learn! 
My favorite is scuba diving, where you use the self contained breathing apparatus to go even deeper.
That's what I always wanted to do on the great barrier reef. I bet it would be beautiful.
The technology of underwater diving actually started with stone weights tied to a person to make a fast decent. One of my favorite things to do.
That sounds scary! I'm glad it's not that dangerous nowadays!
diver is directly exposed to the pressure of the surrounding water. The ambient pressure diver may dive on breath-hold, or use breathing apparatus for scuba diving or surface-supplied diving, and the saturation diving technique reduces the risk of decompression sickness (DCS) after long-duration deep dives. Atmospheric diving suits (ADS) may be used to isolate the diver from high ambient pressure. Crewed submersibles can extend depth range, and remotely controlled or robotic machines can reduce risk to humans.
The environment exposes the diver
Scuba set
A scuba set is any breathing apparatus that is carried entirely by an underwater diver and provides the diver with breathing gas at the ambient pressure. Scuba is an anacronym for self-contained underwater breathing apparatus. Although strictly speaking the scuba set is only the diving equipment which is required for providing breathing gas to the diver, general usage includes the harness by which it is carried, and those accessories which are integral parts of the harness and breathing apparatus assembly, such as a jacket or wing style buoyancy compensator and