<prompt> Bhala okuqhubekayo kwalesi sigaba - Izifundo ezibalulekile zecala ocwaningweni lwe-HRO zifaka kokubili izifundo zezinhlekelele isib.  <response>: , inhlekelele yeChallenger neColumbia, ukuvuza kwamakhemikhali eBhopal, ukuphahlazeka kwendiza eTenerife, umlilo wehlathi iMann Gulch, isigameko somlilo wobungani iBlack Hawk e-Iraq kanye nama-HRO afana nohlelo lokulawula ukuhamba kwezindiza, abathwali bezindiza zasolwandle, kanye nokusebenza kwamandla enuzi. 