what the other player does. for every move the other player can make, it is best for you to go with the strictly dominant strategy. you might be familiar with this concept from the prisoner's dilemma, where the strictly dominant strategy for both players in that game is to rat each other out.
to see why it's a strictly dominant strategy to use a hidden volume, consider both moves the government can make. if the government stops torturing you, then you get a reward of 10 for having a hidden volume and a reward of -10 for not having one. so if the government stops torturing you, it's best if you 