Byrne reboot wiped it out, Infinite Crisis restored it. Elasti-Girl and the others now went through the explosion and things progressed as before Byrne intervened; Robotman survived because of his artifical body, the Chief survived because he had defences built into his chair but went straight into hiding, Negative Man was eventually revealed to have survived but in a coma (his Negative self having already found refuge inside a new, female host Valentina Vostock). The only one who died there was Rita, but she was regrown by the Cheif from a fragment of her body that was recovered from the blast site.