Grayson Islands

A sharp pain on the left side drowned out everything around her. Sotria didn't even immediately realize that the ship had crashed, and that most of the people nearby were dead. She understood that this was her chance to escape. And despite her deplorable physical condition, it would be foolish to ignore it. And what did she have to lose? She was facing execution anyway!
Looking around more carefully, she noticed a sergeant who had died nearby her cell. All that remained was to take the keys from his corpse without attracting the attention of the remaining soldiers.
The sergeant's keys remove the collar, right?