Try to escape

Now's your chance.

You're going to need to get that chain off. Then get to the controls, and figure out how to use them well enough to get back to the space station. Then... run and, and hide, until you can find a way back to Earth or... you'll figure it out later, okay?

The chain itself is strong as steel, but significantly lighter. It seems almost plastic, with the weight, but has the feel, coldness and sheen of metal. It's locked to a metal ring in your collar. The keyhole to the collar is so tiny that it takes you some time to even find it with your fingers. It'd be far too small to fit a bobby pin in, even if you had one. But the collar seems more fragile than the chain; maybe it can be broken?

The other end of the chain is attached to a metal loop physically screwed into the platform. It would take a lot of work, but if you can find something to give you leverage, you might be able to unscrew it...