No one in the opposition movement can behave as if you are in a country where opposition is allowed. You must be ready for what the authorities will do to you.
I advise you to train yourselves to face the abuse you will undergo if you are captured.
From my own experience, this will include beating (with hands, boots, pipes, clubs, and whips); electrocution with electric batons; prolonged periods in shackles and kept in awkward positions; being slammed against walls; being subjected to extreme cold, being drenched in ice-cold water; sleep deprivation and hunger. It will include threats to your life and threats to your family. It will also include the false promise to help you if you cooperate.
The only way to train yourself for the physical abuse is to undergo it voluntarily beforehand with people you know and trust in a safe environment. This will help you to not be shocked by it if you are in custody.