At what depth does a diver experience 3 atmospheres of pressure?

To determine the depth at which a diver experiences 3 atmospheres of pressure, one must consider how pressure increases with depth in water. The pressure at sea level is 1 atmosphere (atm). As a diver descends into the water, the pressure increases due to the weight of the water above them.

For every 10 meters of seawater depth, the pressure increases by approximately 1 atmosphere. Therefore, at a depth of 10 meters, the diver is subjected to a total pressure of 2 atmospheres (1 atm at the surface + 1 atm due to the water). Continuing this reasoning, at 20 meters, the diver would experience 3 atmospheres of pressure (1 atm at the surface + 2 atm from the water above). Hence, the correct depth at which a diver experiences a total of 3 atmospheres of pressure is indeed at 20 meters.