In workplaces that have unions, there is always a form that can be completed if staffing is unsafe. A copy of the form is always directed to an entity OUTSIDE the employer system, which is why employers hate when this form is used.
The form essentially functions as a preemptive incident report. It generally states "I am accepting an unsafe assignment under protest. I have already requested help from ABC and received XYZ response. I will not be held professionally liable for any negative outcomes."
You see if something bad happens because you were stretched too thin, you will be held responsible. Saying you were short-staffed won't get you off the hook unless you have already documented that you asked for help and accepted the assignment under protest.
If you have no preprinted forms, this information can be put on a blank sheet of paper. A copy MUST go to the state regulatory body, a copy to your employer and you keep a copy.
If you insist on staying on this sinking ship of a job, using that form will be your career life preserver.