What was the first form of diving invented?

Breath-hold diving, also called skin diving or free diving is the first documented form of scuba diving.  Today, it is still used for recreational and commercial diving purposes.  With this, by increasing water pressure throughout the dive, a diver’s compressible air spaces are squeezed.  While many people handle breath-hold diving just fine, some people are not as tolerant, making this a limited type of dive.  In addition, people who breath-hold dive are at greater risk for hypoxia, which can cause drowning in one minute or less.