Final answer:
The antonym for 'a means of DIVINATION' is staying underwater for long periods.
Step-by-step explanation:
The antonym for 'a means of DIVINATION' is Staying underwater for long periods. Divination refers to the practice of gaining understanding or guidance about an event or situation, often using methods like reading tarot cards or checking astrological signs. Staying underwater for long periods has no connection to divination, making it the opposite or antonym.