A lung rupture can occur with over-pressurization in water at which depth?

A lung rupture, also known as pulmonary barotrauma, can occur when a diver ascends too quickly from a depth where the ambient pressure changes rapidly, leading to a mismatch between the pressure in the lungs and the pressure of the surrounding water.

The risk of a lung rupture primarily arises at greater depths due to more significant increases in pressure. However, this injury can potentially occur even at shallow depths if a diver holds their breath while ascending. The critical factor is not the depth itself but the rapid or uncontrolled ascent while holding breath, as this can prevent the lungs from equalizing pressure effectively.

While lung rupture can occur at various depths, many divers are trained to be most cautious even at depths as shallow as 4 feet (1.2 meters). This is because, at that depth, the surrounding pressure change, combined with the physiological effects of holding one's breath, can still put someone at risk. Therefore, the choice indicating 4 feet is plausible in highlighting the importance of proper ascent techniques and equalization of pressure throughout diving.