Final answer:
Setting the dry suit exhaust valve correctly does not guarantee that you will never need to manually vent gas during an ascent. Divers should be prepared to manually vent gas if needed to ensure a safe and controlled ascent.
Step-by-step explanation:
The statement is false. Setting the dry suit exhaust valve correctly does not guarantee that you will never need to manually vent gas during an ascent. The dry suit exhaust valve is designed to release excess gas that accumulates inside the suit during a dive. However, during an ascent, as the pressure decreases, gas trapped inside the suit can expand and cause buoyancy issues. In such cases, it may be necessary to manually vent the gas to maintain proper buoyancy.
For example, let's say you have set your dry suit exhaust valve correctly before a dive. As you start ascending, the pressure outside the suit decreases. If you have excess gas trapped inside the suit, it will expand, potentially causing you to become too buoyant. In this situation, you would manually vent the gas by opening the exhaust valve or lifting it slightly, allowing the excess gas to escape and maintaining neutral buoyancy.
So, it is important to not solely rely on the dry suit exhaust valve to manage gas during an ascent. Divers should be prepared to manually vent gas if needed to ensure a safe and controlled ascent.