Any time someone has aspirated water there is a risk that the function of lungs has been compromised and a risk of infection from bacteria in the water. This is very difficult to determine as a lay first aider and via a visual analysis. 

Medical assistance should always be sought after anyone has experienced any degree of drowning. PADI amended the terminology used when teaching EFR and Rescue Diver programs to reflect this.

Near Drowning is no longer used to reduce instances when a rescuer may assist someone that has aspirated water to any degree. They are now considered to have had a drowning incident and must seek medical assistance. 

Open Circuit is popular because of its simple design and relatively low-cost build and maintenance. While using air on this system it makes scuba diving accessible to most people in many environments.

Closed Circuit systems are becoming more and more popular and simpler to use thus gaining popularity. This also allows more affordable and safer exploration into new environments such as caves, wreck, and mines.

I know it's on my bucket list. And you? 

I know you're all fluent in Greek so this one should be pretty simple. Hyper means too much and Kapos means smoke or for us, carbon.

Carbon Dioxide is a primary trigger for the breathing reflex so it's important for our body to regulate how much is in our bloodstream. We can become HyperCapnic during diving by skip breathing, overexerting ourselves or by using poorly maintained equipment. 

Each compartment is named for the time it takes one halftime to complete. A tissue that has is 75% saturated has completed two halftimes, this means if it is a 60 min compartment it would have taken 120 minutes to fill those compartments. 

Constants to PADI physics questions are always listed on them. It states that every metre of fresh water equates to 0.097 ATM of pressure. 

Multiply that by the given depth (40x0.097=3.88) and add 1 ATM for the air atmosphere and you get the correct answer.