Final answer:
If a diver in the chamber has seizures, the chamber operator should decrease the oxygen flow. In an emergency, they should also call a doctor and administer CPR if necessary.
Step-by-step explanation:
If a diver on O2 in the chamber begins to have seizures, the chamber operator should decrease the oxygen flow. Seizures can be caused by oxygen toxicity, which occurs when there is too much oxygen in the body. By reducing the oxygen flow, the chamber operator can help prevent further seizures and potential harm to the diver.
It is important to note that in case of an emergency, such as the diver losing consciousness or stopping breathing, the chamber operator should also call a doctor and administer CPR if necessary, following appropriate protocols.