In some parts of the world if you do not pay back the debt the debt collector can seize any property from you. In the uK debt collection agencies send out bailiffs to the debtors house to collect any property that might be worth something, like cars, computers, furniture, jewellery, which will be auctioned off for roughly 50% of it's value and paid off against the debt. I assume this could extend to Bitcoin. You cannot prevent the Bailiffs from entering your house, if you do they will call the police who will try and force their way in. And you have to pay the Bailiffs a fee too which is automatically added onto the debt. They can also come back as many times as they want. This might seem bad but it isn't as bad as other parts of the world like South Korea where the debt collector can literally just show up at your door and break your legs if you don't pay up.

I'd say it may be possible to hide your money with Bitcoin. If you don't give up the password, there isn't a whole lot they can do about it. Though I strongly advise against doing this as it's almost certainly illegal, though I am not an expert on law or anything.