How long does air supply last at 100 fsw?

The air supply duration at a depth of 100 feet of seawater (fsw) is influenced by several factors, including the diver's breathing rate, the size of the air tank, and the mix of gases in the tank. At 100 fsw, divers typically experience an increased pressure, which can impact the consumption rate of air.

Under pressure, the body requires more effort to breathe due to the density of the air, and divers usually have a higher air consumption rate compared to shallower depths. However, with proper training and efficient breathing techniques, a diver can manage their air supply effectively.

Generally, an experienced diver can maintain air supply for approximately 20 minutes at this depth, considering a standard tank size and average breathing rate. This duration allows for safe ascent and decompression, which are essential for ensuring diver safety during and after the dive. Understanding these parameters assists in dive planning and is crucial for maintaining safe practices underwater.