In Scenario 2, what does the first totem's exploring-for-Mystery option allow, and how often can you use it?

Question

Accepted Answer

The first totem (the Dark Temple) lets an explore action on that tile draw Mystery cards. It is a one-time action, and you cannot use it in the round the totem was found, only in a later round. If the attempt fails you can try again later.

Robinson Crusoe: Adventures on the Cursed Island

In Scenario 2, what does the first totem's exploring-for-Mystery option allow, and how often can you use it?