-Look for things that can help you
From Create Your Own Story
You look to your right and see a table with some tools on it.
You try to reach them and finally after some minutes you get a knife.
It fits into the chainlock and with some work you get it open.
After some minutes you got your other wrist and your ankles free too.
You inspect the room a bit further and realise that there is a locked door and a window shut with planks.
