What does POIS stand for?

The correct answer, which indicates that POIS refers to "Barotrauma related injury from gas expansion," highlights a critical aspect of understanding the risks linked to changes in pressure experienced during underwater operations. POIS involves injuries that occur in the body, particularly in air-filled spaces, due to the rapid changes in external pressure, such as ascending too quickly from depth.

In undersea environments, as divers ascend, the pressure decreases, leading to the expansion of gases within the body – a phenomenon usually managed through slow ascension or safety stops to allow for controlled decompression. When this natural balance is disturbed, it can result in barotrauma, affecting areas like the lungs, sinuses, or middle ear, which can be particularly vulnerable to pressure changes.

Understanding this concept is vital for divers and rescue teams, as it underscores the importance of diving protocols and the risks associated with gas expansion. Familiarity with POIS helps in both preventing and responding to such injuries effectively, ensuring the safety and well-being of individuals involved in underwater operations.