Qeybtan sii wad - Falanqaynta shilalka waaweyn ee ku lug leh qaybo badan oo kala duwan oo bulshada ka mid ah waxay muujinayaan in khaladaadka qarsoon ay halis ugu weyn ku yihiin amniga nidaam adag. Shilalka noocan oo kale ah waxaa ka mid ah shilkii Three Mile Island
, Musiibada Heysel Stadium, Musiibada Bhopal, Musiibada Chernobyl, Musiibada Space Shuttle "Challenger", Dabka King's Cross, "Piper Alpha", iyo MS "Herald of Free Enterprise".