Look for another job while you try, using the utmost discretion and caution, to confirm that what your former colleague has told you is as true as you seem to t

Look for another job while you try, using the utmost discretion and caution, to confirm that what your former colleague has told you is as true as you seem to think that it is. Document your findings/concerns carefully and without drama. If and when the evidence of a threat to life become overwhelming, or incontrovertible (a tricky call, I realise), pass on your findings via an industry or societal whistleblowing platform; maybe even a reputable media organisation, if you believe in such a thing - but try to ensure that any and all information provided cannot be "triangulated" to identify yourself uniquely as the source. The bottom line, though, is your conscience. If someone does die, or it comes out that someone has done already, because of your company's actions, it will also be partly because you kept silent. Avoid posting too much in forums etc. So, look for a career exit, and - if you are sure that your fears are rational and well-grounded - blow the whistle when it is imperative to do so, even if you haven't yet found another job. Perhaps anyone reading this thread who is a principled lawyer, or just a principled person with influence - and better advice than mine - will add something more useful. Whatever happens, I wish you well. Apologies for having so little to offer by way of constructive advice.