I don't think there is a lot you can do.

One thing I've read is that worried parrents calling their childeren on their cells actually give away their positions. So it would be probebly be a good idea to shut it off.

Alse make sure you are in a good physical health, to maximize your escape chances.

Packing a pistol is maybe a vialable option in some US states, but almost illegally in Western Europe